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TIL it would take at least 500 survivors to repopulate the earth (without creating major issues because of inbreeding) after an apocalypse

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JYwn4 TIL by the mid-70's, disco and the Bee Gees were both declining in popularity. "Stayin' Alive" helped both stay alive.
d8mrB TIL that ravens and wolves have formed a mutually beneficial relationship out in the wild. Ravens have been observed calling wolves to the site of dead animals so that the wolves will then open up the carcass and leave the scraps for the ravens once they're finished.
gM0dW TIL Posse Comitatus, an old federal law gives sheriffs the power to form militia's. Only a few states still have the law in full effect it. Last used in 1994, when 100 citizens or "armed volunteers" were tasked by the sheriff to search house to house to find bank robbers. They were done by dinner.
1a71D TIL when you love getting attention and hate it at the same time is called Hedgehog's dilemma
ne4ld TIL a wobble of Earth’s axis causes the Sahara to cycle between desert and grassland every 23,000 years.