Why a Tiny Notch Can Decide Where Something Breaks
A tiny notch can redirect force into a crack tip. Learn how stress concentration becomes fracture mechanics, then compare rounded and sharp flaws in paper.
The Wire That Brakes a Satellite Without Burning Fuel
A conductive ribbon in orbit can turn motion through Earth's magnetic field into electrical current and drag. Explore the physics, energy balance and hard engineering limits of electrodynamic tethers.
Why Your Kettle Gets Quieter Before It Boils
An electric kettle’s loud middle phase comes from vapour bubbles collapsing in cooler water. A simple audio diary can reveal the hidden path from heating to boiling.
The Resistor That Wastes No Power—Until Two RF Signals Disagree
A Wilkinson divider uses quarter-wave lines and a resistor that stays idle for equal signals but absorbs mismatches. Explore the RF physics and its limits.
The Controller That Removes a Delay Without Making Anything Faster
A Smith predictor lets a controller act on a model's immediate response while correcting it with delayed measurements. The clever subtraction, its mathematics, and where it fails.
The Glass Fiber That Measures Strain by Shifting a Reflection
A tiny periodic pattern written into optical fiber reflects one infrared wavelength. Stretch the glass and that wavelength shifts—turning light into a remote strain gauge. Here's the Bragg physics, the…
The Coating That Removes a Reflection by Creating Another
A transparent film about 100 nanometres thick can cut glass reflection by a factor of three. The trick is to arrange two reflected waves to cancel rather than absorb the…
Why Strong Beams Put Material at the Edges
A beam’s strength depends not only on its material but on where that material sits. The I-section turns distance from the neutral axis into stiffness—and exposes new failure modes.
Two Slow Delay Lines Can Measure a Picosecond: The Vernier Timing Trick
A Vernier time-to-digital converter measures intervals far shorter than a logic gate's delay by racing signals through two nearly matched paths. Here is the physics, the arithmetic and the catch.
Your Phone’s Battery Percentage Is an Estimate
A phone’s battery percentage is not a direct reading but a model built from current, voltage, temperature and ageing. Understanding that estimate turns sudden jumps into useful evidence.