› added 8 months ago

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TIL about primordial black holes (PBHs), hypothesized to have formed in the early universe; some small extra-dense spots collapsed into black holes as everything expanded and cooled down. It's also been hypothesized that dark matter, which constitutes 85% of the universe's mass, is made up of PBHs.

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QJb7a TIL That tigers use their tails to communicate. An upright, slowly wagging tail indicates friendliness, while an outstretched, quickly wagging tail indicates excitement, and a tail that is barely moving and angled towards the ground indicates tenseness
9wJmG TIL kangaroos can’t walk forward or backward. They are built to jump. They can also move quickly from side to side with amazing agility, but they cannot jump backward because of their thick, muscular tail. Their long feet and heavy tail also make walking impossible, forward or backward
5YnrR TIL sufferers from Anton–Babinski syndrome are blind, but affirm, often quite adamantly and in the face of clear evidence of their blindness, that they are capable of seeing.
PMaL TIL that the Polish Beer-Lovers Party won 360,000+ votes in Poland’s first free and fair election, in 1991, winning 16 seats in the lower house (Sejm).
NoLQ TIL Charles Darwin married his first cousin Emma Wedgwood, before having 10 children, three of which died before the age of 11. This lead him to wonder whether close genetic matches had an impact on health, adding to his theory of evolution and the passing of traits to offspring.