TECHNOLOGY
A changing magnetic field from a coil beneath the glass induces eddy currents in compatible cookware. Electrical resistance converts their energy into heat, making the pan itself the heating element.
Main ballast tanks switch between surface and submerged states, while smaller tanks tune neutral buoyancy and trim. Underway, diving planes use water flow to guide ascent and descent.
A safety match separates the head's chlorate oxidizer from red phosphorus bound into the box striker. Rubbing creates heat and microscopic contact, initiating a relay that ignites the head and then the wooden splint.
As paper removes ink from the nib, capillary channels replenish it while air bubbles return to the reservoir. Pressure balance and collector fins regulate this exchange, reducing both flooding and starvation.
Paper friction rolls the metal ball, coating it with viscous ink inside the socket and transferring a thin film outside. Precision clearance retains the ball while metering the ink flow.
Trace iron in ordinary glass absorbs visible wavelengths slightly unevenly. A face-on path is too short for much color to show, while the long path through a polished edge accumulates enough selective absorption to appear blue-green.
Classic denim puts indigo-dyed warp yarns on the face while undyed weft shows more clearly on the reverse. Indigo also concentrates around a pale yarn core, so abrasion gradually reveals the lighter structure underneath.
A pressure-sensitive adhesive is soft enough to conform into microscopic surface texture under light pressure, yet cohesive and viscoelastic enough to resist removal and dissipate peel energy. It bonds without drying or curing.
A CD's spiral track repeats at roughly 1.6-micrometer intervals and acts as a reflective diffraction grating. Reflections from adjacent turns reinforce different wavelengths at different angles, producing moving curved color bands.
Wet wool fibers migrate through direction-dependent friction at their scaly cuticles and become entangled under repeated agitation. The fibers need not shorten; the knitted network densifies into a smaller, felt-like structure.
Millimeter-scale apertures heavily attenuate the oven's roughly 12-centimeter microwaves below waveguide cutoff, while visible light hundreds of nanometers long passes through. Door seals and safety interlocks complete the containment system.
A chromium-rich passive film gives stainless steel strong corrosion resistance, not immunity. Chloride-rich crevices, oxygen imbalance, contamination, grade choice, and finish can trigger localized attack.
A Y-shaped channel inside the slider aligns two element rows and engages their projections and recesses sequentially. In reverse, the central wedge separates the closed chain into two paths.
Thermochromic liquid crystals change helical spacing and reflected wavelength with temperature. Finger temperature has many causes beyond emotion, so the ring cannot identify a specific mood.
Uneven wetting and drying make the two faces of a board swell or shrink by different amounts. Grain orientation and construction shape the curve, while ventilating both sides limits the moisture gradient.
The small tactile marks on F and J let both hands find the home row without looking down. Like the bump on numeric-keypad 5, they are landmarks for orientation in a standardized layout.
The recessed dome and outer support ring of a beverage can help it resist pressure and stacking loads. The shape provides stability and strength without simply using a thicker, heavier base.
Bridge expansion joints accommodate movement from temperature change, traffic loading and long-term concrete deformation. They look like gaps but are engineered components that also manage water and reduce structural damage.
A barcode scanner turns differences in light reflected from bars and spaces into electrical signals, then decodes them with standardized rules. The resulting value is usually an identifier used to look up product information.
A 3D printer divides a digital model into thin layers and adds material one layer at a time. Material, layer thickness, supports, and finishing shape the result and its uses.
Microphones and electronics generate an opposing signal that partly cancels ambient sound near the ear. It works especially well for steady low sounds and still relies on passive isolation.
A phone's transparent electrode grid measures tiny capacitance changes caused by a finger. Its controller compares affected rows and columns to calculate touch coordinates.
Electric fields move charged pigments inside microcapsules, and bistability preserves their arrangement. The display film mainly uses power while changing, although device electronics and lighting can still draw energy.
Most international Internet data travels as laser light through submarine fiber. Repeaters amplify fading signals while protective layers and cable ships keep long routes operating.
QR Codes store Reed-Solomon error-correction data alongside their message. Remaining codewords can repair some damage, although essential patterns, contrast and margins still matter.
In lithium-ion batteries, charging and discharging gradually grow interface films, crack electrode particles, decompose electrolyte and consume usable lithium. Together these changes reduce capacity and raise resistance.
A receiver turns satellite signal travel times into distances. It solves ranges from at least four satellites together with its clock offset to obtain a three-dimensional position.
A moth removed from the Harvard Mark II in 1947 became computing folklore, but engineers had used “bug” for technical faults decades earlier.
