104 Inventions and Discoveries Trivia Questions and Answers
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Easy Inventions and Discoveries Trivia Questions
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Who pioneered antiseptic surgery by applying germ theory to surgical practice?
Joseph Lister
Lister used carbolic acid to reduce microbes in wounds, instruments, and dressings. His methods helped lower infection rates after surgery.
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What does a barometer measure?
Atmospheric pressure
A barometer measures the pressure exerted by the air above it. Changes in pressure help meteorologists track approaching weather systems.
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Who was awarded the famous U.S. telephone patent in 1876?
Alexander Graham Bell
Bell's patent covered a practical method of transmitting vocal sounds electrically. Other inventors worked on related ideas, making the history of the telephone highly competitive.
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Who created the tactile writing system used by blind readers?
Louis Braille
Louis Braille was blinded as a small child in his father's leather workshop. As a teenager at a Paris school for blind students in the 1820s he reworked a clumsy military code for reading messages in the dark into a six-dot cell that a fingertip can take in at a single touch.
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The cosmic microwave background is faint radiation left over from which event?
The Big Bang
The cosmic microwave background is the afterglow of the hot, dense early universe, released about 380,000 years after the Big Bang when things had cooled enough for atoms to form and light to travel freely. It was found by accident in 1964 as unexplained hiss in a radio antenna and reaches Earth from every direction at almost exactly the same temperature.
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Who is credited with inventing the cotton gin in 1793?
Eli Whitney
Whitney's machine separated cotton fibers from their seeds much faster than hand labor. That efficiency helped make short-staple cotton a major commercial crop in the American South.
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Who patented dynamite in 1867?
Alfred Nobel
Nobel stabilized the highly explosive liquid nitroglycerin by absorbing it into a porous material. The safer-to-handle result was widely used in construction and mining.
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Which British inventor demonstrated a working incandescent lamp around the same time as Edison, then merged his lighting company with Edison's?
Joseph Swan
Swan first showed a working lamp in Newcastle in December 1878. His British filament patent turned out to predate Edison's, so in 1883 the rivals merged into the Edison and Swan United Electric Light Company, selling bulbs under the brand Ediswan.
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What unit measures electric potential difference?
Volt
The volt measures the difference in electric potential between two points, the push that drives current along a wire. It is named for Alessandro Volta, who built the first battery around 1800.
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Which American polymath used a 1752 kite experiment to argue that lightning is electrical?
Benjamin Franklin
In June 1752 Franklin flew a kite into a thunderstorm and drew charge down the wet string to a key hanging at the bottom, showing that a storm cloud carries the same electricity as a laboratory spark rather than some separate kind of fire.
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Which brothers are associated with the 1783 manned hot-air balloon flight in France?
The Montgolfier brothers
Joseph-Michel and Jacques-Etienne Montgolfier built paper-lined balloons that rose when filled with hot air. Their experiments helped launch the era of human flight.
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Before electric refrigerators, what did most households keep food cold in, restocked by a delivery man every few days?
Icebox
An icebox was a wooden cabinet lined with tin or zinc and packed with insulation, holding a block of ice in a compartment at the top with a drip pan beneath. Ice was cut from frozen lakes in winter, stored under sawdust, and brought round by an iceman until electric refrigerators killed the trade in the 1930s.
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What optical component enlarges an object in a simple magnifying glass?
A convex lens
A convex lens bends light rays inward as they pass through it, so when the object sits closer than the lens's focal length, the eye sees an enlarged, upright image rather than the object itself.
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Which scientist's pea-plant experiments established the basic laws of inheritance?
Gregor Mendel
Mendel found that traits are passed in predictable patterns rather than blending permanently together. His inherited factors were later understood as genes.
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Which chemist organized the periodic table and left gaps for elements not yet discovered?
Dmitrii Mendeleev
Mendeleev arranged elements to reveal repeating chemical patterns. His willingness to leave gaps allowed him to predict the properties of unknown elements.
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What feature did Mendeleev build into his periodic table?
gaps for undiscovered elements
Mendeleev left gaps in the table for elements not yet discovered.
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What signaling system represents letters with short and long signals?
Morse code
Morse code represents letters and numbers through patterns of short and long signals for telegraph communication.
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Which was the first commercially successful fully synthetic fiber, introduced by DuPont in 1938?
Nylon
Nylon was developed at DuPont by a team under Wallace Carothers and reached shops in 1938, first as toothbrush bristles and then as stockings that sold in the millions. Once the United States entered the war, production was redirected to parachutes, ropes and tire cord.
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Which major medical idea did Louis Pasteur help establish?
germ theory of disease
Germ theory holds that microorganisms can cause disease. Its acceptance supported sanitation, antiseptic practice, vaccines, and later antibiotics.
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Who discovered penicillin after mold contaminated a bacterial culture in 1928?
Alexander Fleming
Fleming noticed that Penicillium mold killed bacteria around it. Later researchers developed methods to purify and mass-produce the antibiotic.
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In what year was Alexander Graham Bell granted his landmark U.S. telephone patent?
1876
Bell received the patent as long-distance voice communication was becoming technically feasible. The telephone soon developed into a worldwide network technology.
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What did Galileo use for early observations of the heavens?
A telescope
Galileo used a telescope for his early observations of the heavens. In 1610, he discovered four moons orbiting Jupiter and observed phases of Venus.
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The oldest known wheels, from around 3500 BCE, were used for what?
Shaping pottery
Turning a lump of clay on a flat spinning disc let a potter's hands shape it into an even, symmetrical pot far faster than building it up by coiling or pinching. Wheels mounted on axles for hauling carts arrived only later, as a separate invention entirely.
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In what year did the Wright brothers achieve the first sustained powered airplane flight?
1903
The Wright brothers achieved the first sustained, controlled powered airplane flight in 1903. Their first flight at Kitty Hawk, North Carolina, lasted 12 seconds and covered 120 feet.
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Who discovered X-rays in 1895?
Wilhelm Röntgen
Röntgen discovered that the new rays could pass through soft tissue and expose photographic plates. The discovery quickly transformed medical imaging.
Medium Inventions and Discoveries Trivia Questions
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Who developed the modern ballpoint pen design?
László Bíró
Bíró used a small rolling ball to transfer quick-drying ink to paper. The design was less prone to smearing than a traditional fountain pen.
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What was the Bessemer process designed to produce efficiently?
Steel
The process blasted air through molten pig iron to oxidize excess carbon and other impurities. It greatly reduced the cost and time needed to make steel.
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Who published evidence that blood circulates through the heart and body in 1628?
William Harvey
William Harvey published evidence in 1628 demonstrating that blood circulates through the heart and body. His work overturned the long-standing belief that blood was continuously produced and consumed by the body.
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Which scientist proposed continental drift in 1912?
Alfred Wegener
Wegener argued that today's continents had once formed a larger landmass, later called Pangaea. He lacked a convincing mechanism, which was supplied decades later by plate tectonics.
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Which photographic process, unveiled in Paris in 1839, produced a single image directly on a silvered copper plate?
daguerreotype
The daguerreotype fixed a remarkably sharp image on a polished silver-coated copper plate. Each one was unique, because there was no negative from which copies could be made.
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Who proposed the double-helix model of DNA in 1953?
James Watson and Francis Crick
James Watson and Francis Crick proposed the double-helix model of DNA in 1953, drawing on crucial X-ray diffraction evidence, including Rosalind Franklin’s famous Photo 51.
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Who is credited with identifying the electron in 1897?
J. J. Thomson
Thomson used cathode-ray experiments to show that atoms contained tiny negatively charged particles. The finding overturned the idea that atoms were indivisible.
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What phenomenon did Faraday demonstrate by moving a magnet through a coil of wire?
Electromagnetic induction
In 1831 Faraday showed that a magnet moving through a coil drives a current around that coil, with no battery anywhere in the circuit. Motion alone makes electricity, and that effect, electromagnetic induction, is how every generator and transformer works.
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Which innovation made Gutenberg's printing system practical for many different texts?
movable metal type
Individual metal letters could be rearranged and reused, unlike a woodblock carved for just one page. This flexibility helped printing spread rapidly through Europe.
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What hormone did Banting and Best help isolate?
Insulin
Frederick Banting and Charles Best helped isolate insulin, the hormone that regulates blood glucose. Their discovery soon led to insulin being used to treat diabetes.
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Who pioneered smallpox vaccination by using cowpox inoculation in 1796?
Edward Jenner
Jenner noticed that milkmaids who had caught cowpox seemed to escape smallpox, and tested the idea by inoculating a gardener's son. The word vaccine comes from vacca, Latin for cow.
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Who invented Kevlar while researching strong, lightweight fibers at DuPont?
Stephanie Kwolek
Kevlar is an aramid fiber with very high tensile strength for its weight. It is used in protective armor, helmets, cables, and other demanding applications.
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Who revolutionized microscopy by making powerful instruments with a single tiny lens?
Antonie van Leeuwenhoek
Leeuwenhoek's carefully made single lenses produced remarkably clear images. He used them to observe microorganisms and other details invisible to the naked eye.
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Which law let Mendeleev leave gaps in his table and correctly predict the properties of gallium and germanium?
periodic law
Mendeleev's periodic law originally related repeating properties to atomic weight. The modern table explains the pattern mainly through atomic number and electron structure.
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Who is credited with developing the first practical microwave oven after noticing radar waves heated food?
Percy Spencer
Spencer was working with magnetrons when he noticed that microwave energy melted a candy bar in his pocket. His observation led to a new way of cooking and reheating food.
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In which decade did Samuel Morse develop his electric telegraph system?
the 1830s
The telegraph sent coded electrical pulses through wires. It reduced long-distance message delivery from days or weeks to minutes or hours.
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Who discovered the neutron in 1932?
James Chadwick
The neutron is a neutral particle in the atomic nucleus. Its discovery helped explain atomic mass and made later nuclear physics possible.
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In 1885 Louis Pasteur saved a nine-year-old boy, Joseph Meister, with the first successful vaccine against which disease?
Rabies
Pasteur had never tried the preparation on a human being. Over ten days he injected Meister with a series of doses made from the dried spinal cords of infected rabbits, starting with cord dried longest and therefore weakest and working up to fresher, more virulent material. Because rabies incubates slowly, the immune response outran the infection. The boy lived, and treatment given after exposure rather than before became a real branch of medicine.
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In which decade did penicillin first become available as a mass-produced medicine?
The 1940s
Alexander Fleming noticed in 1928 that a stray mould was killing bacteria on one of his plates, but for years nobody could make the drug in useful quantity. It took Howard Florey and Ernst Chain's Oxford team, and then American drug companies switching from surface-grown mould to deep-tank fermentation, to turn it into a manufactured medicine during the Second World War. Output went from barely enough for a handful of patients to enough for the Allied armies in about three years.
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What sound-recording device did Thomas Edison demonstrate in 1877?
The phonograph
Thomas Edison demonstrated the phonograph in 1877, using a tinfoil-covered cylinder to record and play back sound.
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Which product did 3M scientist Arthur Fry help create using a removable adhesive?
Post-it Notes
Fry's colleague Spencer Silver had made an adhesive that stuck lightly and peeled off cleanly. Fry, tired of bookmarks falling out of his hymn book, turned it into the repositionable note.
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RADAR began as an acronym. What does it stand for?
Radio Detection and Ranging
The US Navy coined the term in 1940. Ranging matters because the system measures distance as well as direction.
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Who discovered natural radioactivity in uranium salts in 1896?
Henri Becquerel
Becquerel found that uranium emitted penetrating radiation without being exposed to sunlight. Marie and Pierre Curie later investigated radioactivity in other substances.
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What locomotive won the Rainhill Trials in 1829?
Rocket
George and Robert Stephenson's Rocket demonstrated an effective combination of boiler, multi-tube design, and exhaust system. The trial helped establish steam locomotion's future.
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A household refrigerator moves heat out of the cabinet using which cycle?
Compressing and expanding a refrigerant
Nearly every domestic fridge runs a vapour-compression cycle. The refrigerant is let through a narrow valve into the pipes inside the cabinet, where it expands and boils, taking heat out of the food; the compressor then squeezes that vapour hard enough for it to condense in the coils at the back, dumping the heat into the kitchen.
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What process strengthens natural rubber by heating it with sulfur?
Vulcanization
Sulfur creates cross-links between rubber polymer chains, making the material more durable and less sticky. The process made rubber useful in tires and many industrial products.
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Who developed the first widely successful inactivated polio vaccine?
Jonas Salk
Salk's vaccine used killed poliovirus and was injected. Albert Sabin later developed a different live-attenuated vaccine taken by mouth.
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SCUBA is an acronym. What does it stand for?
Self-Contained Underwater Breathing Apparatus
The 'self-contained' part is the whole point: the diver carries their air rather than being fed it from the surface.
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What invention by Elisha Otis made passenger elevators practical?
The elevator safety brake
Otis built a catch that grabbed the guide rails if the hoisting rope snapped. He proved it in 1854 by having the rope of his own platform cut in front of a crowd.
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Which farm implement did John Deere redesign in 1837 so that sticky prairie soil slid off it?
The plow
Cast-iron plows clogged in the heavy soil of the Midwest. Deere, a blacksmith in Grand Detour, Illinois, shaped a polished steel blade that scoured itself clean as it cut.
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Which camera did Edwin H. Land put on sale in 1948?
The Polaroid instant camera
Land's Model 95 went on sale in Boston in November 1948. It developed a finished print inside the camera in about a minute.
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What textile machine did James Hargreaves invent in the 1760s?
The spinning jenny
The spinning jenny let one worker spin several threads at once. The water frame was Arkwright's, the power loom Cartwright's, and the cotton gin Whitney's.
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Which device did Mary Anderson patent for use on motor cars?
The windshield wiper
Anderson's 1903 patent covered a swinging arm, worked by a lever inside the car, that cleared rain and snow from the windshield.
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With its ends left open, what does a thermocouple produce when its two junctions are at different temperatures?
A voltage
A thermocouple generates a voltage when its two junctions are at different temperatures, an effect known as the Seebeck effect. The resulting voltage is typically only a few millivolts.
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What cycle moves heat in most modern refrigerators?
a vapor-compression cycle
Most modern refrigerators use a vapor-compression cycle, in which a refrigerant repeatedly evaporates and condenses to move heat out of the fridge. The same basic process is also used in air conditioners and heat pumps.
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Who invented Velcro after studying how burrs hooked onto clothing and fur?
George de Mestral
De Mestral copied the burr's hook-and-loop structure in a fastener. The name Velcro combines parts of the French words for velvet and hook.
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Who built the first battery to deliver a steady electric current, a stack of zinc and copper discs separated by brine-soaked cloth?
Alessandro Volta
Alessandro Volta announced his pile in 1800. Earlier machines could only store a charge and release it in a single spark, so a source of continuous current opened up a whole new field of experiment, and the volt is named after him.
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Which earlier steam engine did James Watt improve with a separate condenser?
Newcomen engine
The Newcomen engine repeatedly heated and cooled its working cylinder, wasting energy. Watt's separate condenser allowed the cylinder to stay hot.
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In which period did James Watt develop the steam-engine improvements that helped power the Industrial Revolution?
The 1760s and 1770s
Watt spotted the waste of heat in a Newcomen engine in 1765 and patented his separate condenser in 1769. He spent the 1770s turning it into a commercial engine in partnership with Matthew Boulton in Birmingham, cutting coal use by around three quarters.
Hard Inventions and Discoveries Trivia Questions
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Which 3M engineer invented masking tape in the 1920s?
Richard Drew
Richard Drew invented masking tape at 3M in 1925 after watching car painters struggle to mask off two-tone paint jobs. He went on to develop cellophane Scotch tape five years later.
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Which ancient masonry binder hardens over years by absorbing carbon dioxide from the air, turning back into the mineral of the stone it was burnt from?
lime mortar
Lime mortar is made by burning limestone into quicklime, slaking it with water and mixing it with sand. It sets slowly by reabsorbing carbon dioxide and reverting to calcium carbonate. Roman lime mortar also carries lumps of unmixed lime that dissolve when water reaches a crack and re-deposit as fresh mineral, sealing it.
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Which material is generally recognized as the first fully synthetic plastic?
Bakelite
Leo Baekeland made Bakelite in 1907 from phenol and formaldehyde, with no natural polymer in it. Celluloid and vulcanized rubber are both treated natural materials.
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Who developed the idea behind the modern barcode?
Norman Woodland and Bernard Silver
Norman Woodland and Bernard Silver developed the idea behind the modern barcode and patented it in 1952. Their original design used concentric circles, inspired in part by Morse code.
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Who discovered the human ABO blood groups?
Karl Landsteiner
Landsteiner showed that blood from different people can react differently when mixed. Matching blood groups made transfusions far safer.
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How did John Harrison's sea clocks let a navigator work out his longitude?
By comparing home-port time with local noon
A clock that kept home time through months at sea let a navigator compare it with local noon. Every hour of difference is 15 degrees of longitude.
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What is the angle between magnetic north and true north called?
Magnetic declination
A compass needle points at the magnetic pole, not the geographic one, and the gap between the two is called magnetic declination, or variation. It differs from place to place and drifts year by year, which is why walking maps print the local figure along with the date it was measured.
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Who demonstrated an early computer mouse in 1968?
Douglas Engelbart
Douglas Engelbart demonstrated an early computer mouse during his landmark 1968 “Mother of All Demos.” The prototype used knife-edge wheels and had only one button.
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Which vehicle, built in 1769, is generally regarded as the first self-propelled road vehicle?
Cugnot's steam tricycle
Nicolas-Joseph Cugnot's three-wheeled steam fardier, built in Paris in 1769 to haul artillery, is generally regarded as the first self-propelled road vehicle. It managed walking pace and had to stop every quarter of an hour to raise steam again.
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Who partnered with Niépce and continued developing photography after Niépce's death?
Louis Daguerre
Daguerre improved photographic exposure and development, eventually creating the daguerreotype. His work helped photography become a public practice.
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What did Humphry Davy produce in 1802 by passing current between carbon rods?
an electric arc
In 1802, Humphry Davy created an electric arc by passing current between two carbon rods. His bright demonstration helped lay the groundwork for later electric arc lamps.
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Who patented a hand-powered dishwasher with wire racks in 1886?
Josephine Cochrane
Cochrane designed racks that held dishes securely while jets of water cleaned them. Her company later became part of the modern KitchenAid dishwasher business.
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Who developed frequency modulation, the broadcasting method used for FM radio?
Edwin H. Armstrong
Armstrong demonstrated wide-band FM in 1935. By varying the frequency rather than the strength of the signal, it shrugged off the static that plagued AM broadcasting.
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What industry first used Carl von Linde's refrigeration system commercially?
breweries
Von Linde installed his first commercial machine at Munich's Spaten Brewery in 1873. It let brewers hold lager at cold-fermentation temperatures year-round, instead of relying on ice cut from frozen lakes each winter and stored through summer.
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What was the name of the 1901 car designed by Wilhelm Maybach?
Mercedes 35 hp
It was named after Mercedes Jellinek, the daughter of Emil Jellinek, the Austrian businessman who commissioned the car and had raced under the pseudonym Monsieur Mercedes. Its low center of gravity and honeycomb radiator helped it dominate early motor racing.
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What communication technique did Hedy Lamarr and George Antheil patent in 1942?
Frequency-hopping spread spectrum
Their 'Secret Communication System' skipped a radio signal between frequencies so it could not easily be jammed. The idea for keeping both ends in step came from Antheil's work with player-piano rolls.
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Whose 1923 patent added a third, all-directions stop position to the traffic signal?
Garrett Morgan
Earlier signals flipped straight from stop to go, so cars entering from both directions collided. Morgan's T-shaped signal paused everyone in between, the ancestor of the amber light.
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Who led the team that built the A-0 system, an early compiler that turned symbolic code into machine instructions?
Grace Hopper
Hopper's A-0, written for the UNIVAC I around 1952, assembled stored routines into a runnable program. Her later work fed directly into COBOL.
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Who discovered the period-luminosity relation for Cepheid variable stars?
Henrietta Swan Leavitt
Leavitt found that the slower a Cepheid pulses, the brighter it truly is. That turned the stars into distance markers, and Hubble used them to show that other galaxies lie far beyond our own.
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Who showed that Earth has a solid inner core inside its liquid outer core?
Inge Lehmann
In 1936 the Danish seismologist explained stray earthquake waves arriving where the liquid core should have blocked them: something solid at the centre was bouncing them back.
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Who demonstrated the first working integrated circuit at Texas Instruments?
Jack Kilby
Kilby's germanium chip worked on 12 September 1958. Robert Noyce reached the silicon version independently at Fairchild months later, and the two are usually credited together.
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Which astronomer, then a graduate student, first recognized the radio pulses that became known as pulsars?
Jocelyn Bell Burnell
Bell Burnell spotted a repeating signal in 1967 on the chart paper of a radio telescope she had helped build. The 1974 Nobel for the discovery went to her supervisor and to Martin Ryle, not to her.
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Who added steam power to a major printing press used by The Times of London in 1814?
Friedrich Koenig
Friedrich Koenig introduced steam-powered printing to The Times of London in 1814, greatly increasing the speed of newspaper production. His press could print about 1,100 sheets per hour, far faster than traditional hand-operated presses.
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LASER is an acronym. What does it stand for?
Light Amplification by Stimulated Emission of Radiation
It was named after the earlier MASER, which did the same thing with microwaves rather than light.
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Who patented an important lockstitch sewing machine design in 1846?
Elias Howe
Howe's machine used a needle with an eye near its point and a shuttle carrying a second thread. The lockstitch became a foundation of later household and industrial sewing machines.
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William Henry Perkin was trying to synthesize quinine when he accidentally produced which dye?
Mauveine
The 18-year-old Perkin was left with a black sludge in 1856 that stained silk a rich purple. Mauveine became the first synthetic dye made on an industrial scale.
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Who invented a modern air-conditioning system for controlling humidity in a printing plant?
Willis Carrier
Carrier's 1902 system controlled humidity so paper would not expand and contract unpredictably. The same technology later became the basis of comfort cooling.
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Who made the world’s first surviving photograph in the 1820s?
Joseph-Nicéphore Niépce
Niépce used bitumen on a pewter plate in a process called heliography. The surviving image is conventionally known as View from the Window at Le Gras.
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Who developed the first practical compound steam turbine in 1884?
Charles Parsons
Parsons's turbine converted high-pressure steam into rotary motion efficiently. Turbines later became important for electrical generators and fast ships.
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Who transmitted the first all-electronic television image in 1927, using a tube he called the image dissector?
Philo T. Farnsworth
Farnsworth, then 21, transmitted a single straight line on 7 September 1927. Baird's rival system scanned the picture with a spinning perforated disc rather than electronically.
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Who created Portland cement in 1824?
Joseph Aspdin
Aspdin calcined limestone and clay and named the resulting cement for its resemblance to Portland stone. Portland cement became a foundation of modern concrete construction.
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Joseph Marie Jacquard's loom, introduced in the early 1800s, read its weaving patterns from what?
Punched cards
The holes in each card decided which warp threads lifted for one pass of the shuttle. Charles Babbage borrowed the idea, and punched cards were still feeding computers 150 years later.
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Who launched the world's first liquid-propellant rocket in 1926?
Robert H. Goddard
Goddard's gasoline and liquid-oxygen rocket flew from a field in Auburn, Massachusetts on 16 March 1926. It climbed about 41 feet and the flight lasted two and a half seconds.
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What volcanic material helped ancient Roman harbor concrete remain durable underwater?
pozzolana
Pozzolana is volcanic ash that reacts with lime and water to form a durable cement. Roman builders used it in harbor structures that have survived for nearly two millennia.
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Who patented the modern safety pin in 1849?
Walter Hunt
He reportedly designed it in about three hours while twisting a piece of wire, hoping to pay off a $15 debt. He then sold the entire patent for $400, a fraction of the fortune it went on to earn its buyer.
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SONAR is an acronym. What does it stand for?
Sound Navigation and Ranging
Sonar was built for the sea, where sound travels far and light does not, and was named to parallel radar.
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Who invented the first practical stethoscope in 1816?
René Laennec
Laennec first used a rolled sheet of paper and then developed a wooden tube. The instrument let physicians listen to sounds inside the chest without placing an ear directly on the patient.
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What calculating machine did Blaise Pascal build in the 1640s?
The Pascaline
Pascal began the geared adding machine in 1642 to help his father with tax accounts. Babbage's Difference Engine and Thomas de Colmar's arithmometer came nearly two centuries later.
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Who isolated artemisinin, a key antimalarial compound, from sweet wormwood?
Tu Youyou
Tu combed classical Chinese medical texts for malaria remedies, and a fourth-century line about steeping wormwood in cold water told her that heat was destroying the active compound. She shared the 2015 Nobel Prize.
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Which inventor is associated with the modern zipper design?
Gideon Sundback
Gideon Sundback developed the interlocking-tooth zipper design that became widely practical.
Answered in full
These come up often enough that each one has its own page.
- Who discovered the human ABO blood groups?
- Who patented dynamite in 1867?
- What unit measures electric potential difference?
- Who transmitted the first all electronic tv picture?
- Who launched the world's first liquid-propellant rocket in 1926?
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