
Franz Reichelt’s Eiffel Tower Jump: The Parachute Was Big Enough
Franz Reichelt's Eiffel Tower jump killed him in 3.4 seconds. His parachute suit was close to the right size. The way it opened never could be.

Franz Reichelt's Eiffel Tower jump killed him in 3.4 seconds. His parachute suit was close to the right size. The way it opened never could be.

The Tsar Bomba yield everyone quotes was never detonated. Swapping lead for uranium halved the bomb and cut its fission output by 97%.

AI energy per query differs 2.4x for the same median prompt depending on method, and the popular figure answers a narrower question.

The Kola Superdeep Borehole stalled before the money ran out: at 180°C the granite went ductile and sealed the hole around the drill.

The Vela Incident's bhangmeter was 41-for-41 on real nukes before 1979's double flash. Its optics, more than the spies, keep the case disputed.

Challenger's coldest prior flight had its O-rings at 53°F. On launch day the failed joint was estimated at 28°F, about 25 degrees colder.

Thomas Midgley's leaded gasoline beat ethanol because it could be patented. Better combustion chemistry had little to do with it.

800V DC is replacing 54V busbars in AI racks because 1MW at 54V means about 18,500 amps. How much copper it saves depends on the baseline: the widely quoted 45% compares busways with 415V AC, not the in-rack step.

AI model collapse comes from uncurated synthetic data, and the text shortage only pushes labs toward it. Curation decides which labs keep improving.

Why is the LHC colder than outer space? At 1.9 Kelvin helium turns superfluid, and that quantum threshold keeps 9,000 magnets from quenching.

Local opposition blocked or delayed $130 billion of US data-center projects in Q1 2026. Why permits, not only power or chips, now limit the AI buildout.

PII masking AI agent design is quietly becoming standard — six unrelated vendors converged on mask-then-send without comparing notes.