How does a fibre-optic strand thinner than a spaghetti noodle carry a signal across 13,000 kilometres of ocean without a single electrical amplifier along the way? Saving Tips August 21, 2026 A signal can cross 13,000 kilometres without an electrical amplifier acting on the data because a chain of erbium-doped fibre…
When you tilt a smartphone, gravity shifts microscopic silicon fingers inside its accelerometer by only a few nanometres, changing the capacitance between them and producing the electrical imbalance the phone reads as a new direction for down Saving Tips July 27, 2026 Turn a smartphone from portrait to landscape and the display follows within a fraction of a second. The motion feels…
In 1911, the Dutch physicist Heike Kamerlingh Onnes cooled a thread of mercury to 4.2 kelvin in a bath of liquid helium and its electrical resistance vanished completely, and a current set circulating in a superconducting loop like that will still be flowing years later, indistinguishable from the day it began Saving Tips July 24, 2026 Drop a small ring of superconducting metal into a bath of liquid helium, nudge a current through it, and remove…
