Technology
Discover facts about technology. Small discoveries that change the way you see familiar things.
Technology
What keeps your washing machine from becoming a shock trap
If a live wire touches a washer's metal casing, an equipment-grounding conductor provides a low-resistance fault path that helps protective devices disconnect…
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Some power lines convert electricity twice to lose less
High-voltage DC links convert alternating current to direct current for transmission, then back again at the other end. The converter stations cost money, but…
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How distillation separates mixed liquids
Liquids vaporize at different temperatures: heat the mixture, capture the more volatile vapor, then cool it back into liquid. The same principle underlies…
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Curved glass tricks your brain into seeing things
As light enters and leaves glass, its speed changes and it bends. Shaped lenses use this refraction to focus or spread light, changing the image you see.
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Racing liquid mixtures exposes their hidden ingredients
Chromatography separates a mixture as a solvent carries it through a medium. Its components travel at different rates, revealing what the mixture contains.
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Scientists can map molecules by touch
A microscopic probe scans a molecule’s surface, while a laser tracks the probe’s tiny deflections to map its contours.
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Jumping electrons inside crystals emit cold bright light
In an LED, electrons crossing a semiconductor gap release photons as light, rather than heating a filament as in an incandescent bulb. That makes LEDs more…
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Particle detectors can measure a particle by stopping it
A calorimeter measures a particle’s energy by absorbing it in dense material and measuring the resulting heat or light.
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A microscopic silver layer makes mirrors work
A thin layer of silver on glass reflects visible light because the metal’s free electrons repel incoming electromagnetic waves.
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Burning chemicals reveals their deepest elemental secrets
Each element emits or absorbs light at characteristic wavelengths. A spectrometer reads that pattern like a barcode, helping chemists identify what a sample…
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Forcing twisted light waves to reveal molecular handedness
A polarimeter sends polarized light through a substance and measures whether it rotates left or right—a clue to whether its molecules are chiral.
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X-rays see through flesh without a knife
X-rays pass through soft tissue more easily than bone, creating an image of dense bones without surgery.
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How weighing atoms reveals what's in a sample
Mass spectrometry ionizes a sample and separates its particles by mass-to-charge ratio, revealing what the sample contains.
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How scientists track particles through boiling liquid
As a particle passes through superheated liquid hydrogen, it boils the liquid along its path, leaving a tiny trail of bubbles scientists can follow.
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Measuring invisible force fields reveals hidden metal
A magnetometer measures the strength and direction of magnetic fields; changes in those fields can reveal buried metal, including unexploded ordnance.
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How electron traffic jams power radar
A klystron bunches a steady stream of electrons into tight clusters, then uses their kinetic energy to generate powerful radio waves. This electron “traffic…
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Surrounding yourself with metal wire blocks invisible waves
A Faraday cage works by distributing incoming electromagnetic radiation across its conductive exterior, reducing the field inside. A metal mesh can serve as…
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Superimposing light waves measures microscopic changes
An interferometer splits a beam along two paths and recombines it; tiny changes in path length alter the interference pattern, revealing shifts smaller than…
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Judging the precise darkness of a liquid objectively
A colorimeter shines selected wavelengths through a sample and measures how much light it absorbs, replacing subjective descriptions like “bluish-green” with…
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How spinning electrons produce powerful X-rays
In a synchrotron, electrons race around a ring near light speed and emit intense radiation. Beamlines direct the resulting X-rays to reveal molecular…
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The tiny screw that measures a lens's curve
Three fixed legs rest on the lens while a central screw measures its curve, letting the spherometer calculate the surface's radius.
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Catching the most violent energy bursts in the universe
Dense crystals or semiconductors detect high-energy gamma-ray photons and convert their signals into data, letting scientists study events such as exploding…
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The badge that records your radiation exposure
Dosimeters track cumulative exposure to ionizing radiation over time. Some use film that darkens as it records exposure, since radiation can’t be sensed by…
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Forcing oxygen and hydrogen to mingle creates pure energy
A fuel cell routes hydrogen’s electrons through a circuit to generate electricity; the reaction with oxygen produces water.
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