The Roadster Does Not Fly: Two Gs Down and Two Seconds Up
Tesla put a 56-year-old suction fan and a spacecraft attitude-control system in a road car, and the disclosed numbers say the entire air supply buys under two seconds of thrust.
Math
Karpathy's Funnel: The Arithmetic Holds and the Denominator Is a Choice
Every write-up of Karpathy’s four tier funnel repeats his four counts and none of them re-divides them. Against the population that could plausibly use a model, the bottom tier is not 75 per cent of the world, it is 99 per cent of everyone still standing.
The Oldest Light: How We Measure 13.8 Billion Years Without a Stopwatch
We cannot time the universe with a stopwatch. Here is how astrophysicists measure the 13.8-billion-year age of the cosmos using the Cosmic Microwave Background, atomic recombination, and three independent clocks.
Can Every Problem Be Solved by an Algorithm? Alan Turing's 1936 Proof
A step-by-step deconstruction of Alan Turing’s 1936 paper: how formalizing the mechanical computer and adapting Cantor’s diagonal argument proved that algorithmic omniscience is mathematically impossible.