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TIL Stephen Hawking once sent his PhD student away with a very hard problem – finding exact rotating black hole solutions of Einstein’s equations with a cosmological constant – and was stunned when he came back a few days later with the solution

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via reddit.com

Bgadb TIL about Project December, which is an AI that someone used to generate a simulated conversation with their dead fiancé in 2021.
BrVYy TIL that reindeer are the only mammals that can see ultraviolet light. This means that they can easily tell the difference between white fur and snow because white fur has much higher contrast. It helps them discover predators early in snowy landscapes.
ZbZB TIL that certain medical equipment requires steel produced before the first atomic bomb tests due to atmospheric radiation (usually from ships sunken prior to ww2)
Z8XNv TIL that the earth will become inhospitable to life in 2 - 3 billion years as the sun increases in temperature, pushing the habitable Goldilocks zone to Mars or beyond.
aPBJ TIL When three-letter airport codes became standard, airports that had been using two letters simply added an X.