Technology
Discover facts about technology. Small discoveries that change the way you see familiar things.
Technology
Smaller gears orbiting a central sun multiply sheer torque
In a planetary gearset, a central sun gear meshes with smaller planet gears that roll inside an outer ring. This arrangement can multiply torque in a compact…
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How a spinning wheel creates mechanical stutters
A rotating pin slides in and out of a slotted wheel, turning continuous motion into precise, intermittent steps.
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How mismatched lines measure tiny distances
The two scales differ slightly; the matching pair of lines reveals a small offset that can be read as a fraction of a millimeter.
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Dipping steel in molten zinc provides sacrificial armor
The steel is dipped in molten zinc, which bonds to its surface. If corrosion begins, the zinc rusts before the steel does, sacrificing itself to protect the…
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Slanted gear teeth gently mesh smoothly to prevent whining
Their angled teeth engage gradually and stay in contact as they turn, reducing the abrupt impacts and noise of straight-cut gears.
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How invisible argon protects molten metal
Argon displaces air around the molten weld, keeping oxygen from contaminating the metal as it cools.
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Screw threads spin gears but block backward reverse
The screw can drive the wheel, but the wheel can't drive the screw backward, making the mechanism self-locking.
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Twisting a single metal barrel tightens two opposing cables
A turnbuckle has reverse threads at either end. Turning its center pulls both threaded ends inward at once, taking up slack in the cables.
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The giant weights keeping skyscrapers steady
A heavy pendulum near the roof swings against the building’s motion, reducing sway in strong winds and helping keep occupants comfortable.
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Why revolving doors block more than the wind
Their rotating panels maintain an air barrier between indoors and outdoors, reducing pressure differences that can turn ordinary lobby doors into wind tunnels.
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How nitrogen gives steel a tougher outer skin
Nitriding heats steel in an ammonia-rich atmosphere, allowing nitrogen to diffuse into its surface and form a hard, wear-resistant outer layer.
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How Kevlar catches bullets with plastic fibers
Tightly woven synthetic fibers spread a bullet's impact across millions of threads, helping catch it before it penetrates.
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Metal spheres practically eliminate grinding friction
Ball bearings place small spheres between two rings, letting one ring roll over the other instead of sliding. This reduces friction and helps keep machinery…
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Nitinol wire can remember its original shape
Heating rearranges Nitinol’s crystal structure, allowing the wire to return to its original shape after being bent.
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Tilted molds ensure hot plastic products actually eject
As plastic cools and shrinks, a slight taper keeps the part from gripping the mold walls, allowing it to pop out cleanly.
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Rolled metal bands provide exactly the same tension
As the outer loop of the coiled steel ribbon unrolls, the spring’s pull stays nearly constant instead of growing harder like an ordinary spring.
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The AI-written poetry book that appeared in 1984
In 1984, a program called Racter published The Policeman's Beard Is Half Constructed, a book of strange, free-associative prose generated by a computer.
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Compound bow cams let archers hold heavy tension with much less effort
Near full draw, the cams shift the bow's leverage, reducing the force needed to hold the string steady before release.
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How scuba gear lets you breathe underwater
A two-stage regulator reduces the tank's pressure and delivers breathing gas at the surrounding water pressure, so divers don't inhale a direct blast from the…
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Bicycle helmets crush once to absorb deadly impacts
The foam liner crushes in a crash to absorb energy and slow the head's deceleration. Once crushed, it can't protect you the same way.
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Modern trampolines cross springs for balanced bouncing
On some high-end models, crossed springs distribute tension more evenly across the mat, helping steer off-center jumpers back toward the middle instead of…
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A hole can make a round parachute steadier
A vent at the top lets trapped air leave more evenly instead of repeatedly spilling from alternate edges. That reduces swinging under the canopy. The opening…
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Why bowling lanes help your ball find the pins
Oil in the middle lets the ball skid farther, while the drier edges create more friction and can steer it back toward the pins. The pattern gives bowlers some…
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Windshield wipers use articulated frames for pressure
The brackets divide the blade into sections, letting each part follow the windshield’s curve so the rubber stays in contact instead of leaving streaks.
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