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1,389 cards. Each one is a 40-second story with a five-minute read behind it. Page 16 of 24.

901. Every woven cloth comes from the same three moves, repeated endlesslyWhether it is a stick frame in a nomad's tent or a powered factory machine, a loom has one core job: keep a set of lengthwise threads tight so a crosswise thread can weave over an…
902. The Central American cane knife that became a Connecticut brand nameAcross Latin America a good machete was once simply called un collin, after a company in Collinsville, Connecticut. Founded in 1826 to make axes, Collins and Company sold its firs…
903. From the blacksmith's hammer to a machine that bends metal with 3,000 tonsThe back plate of your computer case was almost certainly shaped by a press brake, a machine that folds sheet metal with forces reaching 3,000 tons and, under computer control, la…
904. Why stop-motion animators love clay that never dries outLeave a lump of ordinary pottery clay out and it hardens as its water evaporates. Oil-based modelling clay does not, because oil stays put. That simple difference keeps it soft fo…
905. Nails were once so precious that colonists burned houses to recover themIn colonial Virginia, families moving on would sometimes set fire to the house they were leaving, then sift the ashes for its nails. Iron nails were scarce and costly, mostly made…
906. Standard nuts and bolts let the Crystal Palace rise in 190 daysFor centuries each nut was made to fit one particular bolt, and no other. Lose one and you had to make a replacement by hand. Then, in 1851, the builders of London's Crystal Palac…
907. The first ovens were pits for roasting mammoth 31,000 years agoLong before bread, kitchens or even farming, people in Central Europe were cooking mammoth in roasting and boiling pits dug inside their shelters, around 29,000 BC. An oven, at he…
908. A 100,000-year-old paint kit and the long road to the tinIn Blombos Cave in South Africa, archaeologists found an ochre mixture about 100,000 years old that could have served as paint, and later a whole kit for grinding pigments. For mo…
909. A tenth-century caliph asked for a pen that would not stainIn 953, the Fatimid caliph of Egypt, al-Mu'izz, demanded a pen that would not dirty his hands or clothes. His craftsmen delivered one that stored ink inside and fed it to the nib,…
910. Every knot you tie makes your rope weakerTie a knot in a rope and pull until something gives: the break almost always comes at the knot or right beside it. The bends and pinches that hold a knot together stress the fibre…
911. The lathe spins the work, not the tool, and built the machine ageMost tools move while the material sits still. A lathe does the opposite: it spins the workpiece and lets a fixed tool carve it, producing anything round, from bowls and baseball …
912. How an 1830 grass-cutting machine helped write the rules of modern sportBefore 1830, a smooth lawn meant a scythe or a flock of grazing animals. Then Edwin Budding of Stroud patented a push-along machine with a spinning cylinder of blades. Its even, c…
913. Seesaws, tweezers and the bones in your ear all obey one ruleA lever is nothing more than a rigid bar turning on a pivot, yet it lets a small push lift a heavy load. The trade is distance: the end you press travels further than the end doin…
914. The ramp was the last simple machine anyone admitted was a machineAncient Greek thinkers named five simple machines and left out the ramp, even though people had been dragging heavy loads up slopes since prehistory. As late as 1826 Karl von Lang…
915. The favourite ink of medieval scribes is slowly eating Bach's original scoresFor centuries iron gall ink, brewed from iron salts and tannin from tree galls, was considered the finest ink available. It is also acidic. About a quarter of the Johann Sebastian…
916. From a pharaoh's water clock to the 4-20 milliamp signal running factoriesIn 1663 Christopher Wren showed the Royal Society a design for a weather clock, with sensors steering pens across paper driven by clockwork. Meteorologists ignored the idea for ab…
917. How a buried valve, a plunger and a rubber diaphragm switch on your lawn sprinklersWhen an underground sprinkler zone springs to life, the trigger is tiny. A magnetised solenoid lifts a small stainless steel plunger, letting water bleed off the top of a rubber d…
918. Two young engineers, unaware of each other, raced to build the first jet engineFrank Whittle, an RAF College Cranwell cadet, put his turbojet idea to his superiors in 1928 and patented it in 1930, but could not get the British government interested. In Germa…
919. A socialite tired of chipped china built the first dishwasher that caught onJosephine Cochrane was wealthy enough to have servants, and that was her problem: they kept damaging her good china while washing it. In 1886, working with a mechanic in her tool …
920. Gun barrels, curling stones and shaking bits: the hidden craft of drilling holesA gun drill can bore a hole more than 300 times deeper than it is wide and stay dead straight. The trick, first worked out for rifle barrels, is a bit that centres itself, riding …
921. A wire circling a magnet in mercury started a century of electric motorsDown in the Royal Institution's basement on 3 September 1821, Michael Faraday hung a wire into a pool of mercury with a magnet in it. When current flowed, the wire swept around th…
922. Why the wires inside your cables are twisted, braided, tinned and wrappedTake a pair of wires, clamp one end in a hand drill and spin it while keeping the line taut. The result is a twisted pair, one of the simplest defences against electrical interfer…
923. Engine shares a root with ingenious, and the first fire engines were just pumpsThe word engine comes through Old French from Latin ingenium, the same source as ingenious. Before factories, it meant clever war machinery: catapults, trebuchets and battering ra…
924. Two hundred billion a year: the humble fastener and its counterfeit problemAmericans get through more than 200 billion fasteners every year, and carmakers alone account for 26 billion of them. In 1988 a congressional subcommittee discovered that fake, mi…
925. Maple teeth, bronze wheels and plastic gears built to break on purposeAs late as 1967, a New Hampshire firm, Thompson Manufacturing of Lancaster, was selling tens of thousands of maple gear teeth a year. Its customers were paper mills and grist mill…
926. The hammer may be humanity's oldest tool, and its physics is surprisingly cleverNear Kenya's Lake Turkana in 2012, Sonia Harmand and Jason Lewis of Stony Brook University found a large cache of shaped stones used for bashing wood, bone and other rocks, dated …
927. After the plough comes the harrow, from Han dynasty rakes to concrete-weighted giant discsA plough leaves a field of furrows and big clods, which is useless for planting small seeds. The harrow follows to crumble that rough ground into fine, even tilth. Chinese farmers…
928. In a Sumerian poem the hoe argues with the plough, and the hoe winsSome four thousand years ago, Sumerian scribes wrote a debate in which a talking hoe and a talking plough trade boasts about which is more useful. The hoe is declared the winner. …
929. Some chisels are made of beryllium copper so they will never sparkAlmost every cold chisel for cutting metal is hardened steel. But where a single spark could be disastrous, toolmakers use beryllium copper instead. It is one of many small adapta…
930. A spin extractor can remove more water in two minutes than a dryer in twentyHospital laundries often put wet sheets through a centrifuge before any heat touches them. Spinning far faster than a washing machine, these extractors can shed as much water in a…
931. Old teleprinters printed each letter with a clutch that turned exactly onceEvery character arriving at a teleprinter tripped a special clutch that engaged the motor for precisely one revolution, drove the print mechanism through a single cycle, and then …
932. Early combines were pulled across the American plains by twenty horsesAround 1900, farmers on the American plains and in Idaho hitched teams of twenty or more horses to giant combines. The machines took their name from combining separate jobs, reapi…
933. Storing food in containers is a habit no other primate sharesPeople have been carrying and storing things in vessels for 100,000 years at the very least, perhaps for millions. The first were probably natural objects such as hollow gourds, u…
934. Eli Whitney's cotton gin was meant to save labour and ended up demanding moreWhitney hoped his 1793 machine would cut the work needed to process cotton. Instead, cleaning became so fast that picking turned into the bottleneck, driving demand for field labo…
935. The rotary tiller was born on an Australian farm using a steam tractorIn 1912 a young Australian named Arthur Clifford Howard began spinning blades through the soil on his father's farm at Gilgandra, New South Wales, powered by the family steam trac…
936. Ancient Greek actors amplified their voices with horn-mouthed masksIn fifth-century BC Greece, theatre masks had horn-shaped mouth openings that acted as acoustic megaphones, pushing actors' voices across open-air amphitheatres. More than two tho…
937. Indigenous Australians were grinding axe edges at least 44,000 years agoHumanity's first axes had no handles at all: chipped stone hand axes go back roughly 1.6 million years. The leap to polished, ground edges happened first in Australia, where fragm…
938. Some trucks raise an axle off the road when it isn't neededHeavy dump trucks and trailers often carry a lift axle that can be lowered to spread a load across more tyres, say to cross a weight-limited bridge, then hoisted clear of the road…
939. Torricelli hid his barometer experiments amid neighbourhood rumours of sorceryWhen gossip spread through Evangelista Torricelli's Italian neighbourhood that he was dabbling in witchcraft, he decided to keep his experiments quiet to avoid arrest. Switching f…
940. The first ball bearings to win a race were on a bicycle in 1869In August 1869 a Parisian bicycle mechanic named Jules Suriray patented a radial ball bearing. That November his bearings were fitted to the bike James Moore rode to victory in th…
941. The first mass-produced toothbrush was dreamed up by a man in prisonIn the 1700s William Addis, after a spell in prison, began drilling holes into a handle and gluing in tufts of bristle. It was the first toothbrush made at scale, and the method c…
942. A Chinese bronze caliper from 9 AD was already marked in tenths of an inchDuring the brief Xin dynasty, Chinese craftsmen made a bronze caliper with a slot and pin, graduated in inches and tenths, and dated by inscription to the first day of the first m…
943. A working centrifuge can now be 3-D printed for about 25 dollarsOpen-source designers have published a hand-powered centrifuge that spins at more than 1,732 revolutions per minute and can be printed entirely on a 3-D printer for roughly 25 dol…
944. A chain is a rope when pushed and a rod when pulledCompress a chain and it folds and curves as limply as rope. Pull it tight and it becomes straight, rigid and able to bear enormous loads. That split personality explains why the s…
945. The chainsaw began as a surgeon's instrument, not a logger'sBefore anyone used a toothed chain on trees, two Scottish doctors in the 1780s used a fine serrated chain between wooden handles as a flexible surgical saw. Decades later a German…
946. Modern air conditioning was invented to keep ink lined up in a Brooklyn print shopWillis Carrier's 1902 system for a Brooklyn lithography firm was not built for human comfort. It controlled humidity so paper would stop swelling and shrinking, keeping colour ink…
947. The Archimedes screw may have been watering Babylon's gardens before ArchimedesTradition credits Archimedes with the water screw, supposedly after a visit to Egypt. But one Assyriologist argues that an inscription of the Assyrian king Sennacherib describes b…
948. The first inventions came before modern humans existedHuman ingenuity is older than humanity itself. Crude Oldowan stone tools date back roughly 2.9 million years, long before anatomically modern people appeared. Rafts and cooking al…
949. A French painter in Brazil may have named photography before anyone in EuropeHércules Florence, a French artist living in Campinas, Brazil, was experimenting with silver salts on paper by 1832 and called the result photographie in private notes apparently …
950. Polaroid sheets work because stretched plastic lines up iodine electronsThe polarising film in sunglasses and phone screens is a sheet of polyvinyl alcohol plastic laced with iodine. Stretching it during manufacture lines its long molecules up in one …
951. Most prisms are used to flip images, not to make rainbowsSplitting white light into a rainbow is the most famous thing a prism does, but it is not what prisms are mostly used for. Inside binoculars and single-lens reflex cameras, prisms…
952. Radio astronomy began with a Bell Labs engineer hunting for telephone staticIn 1932 Karl Jansky of Bell Telephone Laboratories was asked to track down static that might disturb radiotelephone calls. Besides near and distant thunderstorms, his rotating ant…
953. Cooking with fire may have helped make humans brainierCharles Darwin ranked the discovery of fire as perhaps humanity's greatest. People have used it continuously for at least 1.5 million years, and cooking made food easier to digest…
954. The word telescope was coined at a banquet for Galileo in 1611Galileo called his instrument a perspicillum. The name that stuck came in 1611 from Giovanni Demisiani, a mathematician of Greek origin, who proposed it at a banquet of Rome's Acc…
955. A theodolite measures angles so finely it can resolve seconds of arcThat telescope on a tripod you see at roadworks is a theodolite, and it is built to measure angles, not distances. Swivelling around two axes, it records exactly where it points b…
956. Michelson moved his light experiment out of Berlin because horses shook the groundIn 1881 Albert Michelson built an instrument to detect Earth's motion through space by comparing two beams of light. Central Berlin's horse traffic caused too much vibration, so h…
957. Strictly speaking, the laser should have been called a loserLaser stands for light amplification by stimulated emission of radiation. But a laser that makes its own light is really an oscillator, not an amplifier, so physicists have joked …
958. The word lens comes from the Latin for lentilA lens bulging on both sides looks a lot like a lentil, and that is exactly where the name comes from: lens was the Latin word for the legume. The object itself may be far older t…
959. Galileo called his microscope a little eye before a friend renamed itWhen Galileo presented a compound microscope to Rome's Accademia dei Lincei in 1625, he called it the occhiolino, or little eye. His fellow academician Giovanni Faber came up with…
960. The oldest manufactured mirrors were polished volcanic glass, some 8,000 years oldBefore glass and silver, people looked at themselves in obsidian, a natural volcanic glass polished to a shine. Examples from Çatalhöyük in Anatolia date to around 6000 BCE. For m…

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