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TIL that while abundant in the universe, Helium is a finite resource on Earth and cannot be manufactured. Its use in MRI’s means a shortage could seriously affect access to this life saving technology.

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via reddit.com

LbO9 TIL that During WWII, two polish doctors saved 8,000 Jews from the Holocaust by faking a typhus epidemic that stopped the Nazis from entering their town.
7rZRb TIL: When foxes discovered fairy penguins on a small Australian island, they nearly wiped the colony out. Swampy Marsh, a chicken farmer, began sending Maremma dogs to protect the birds. Over the next 10 years not a single penguin was killed by a fox.
X45j TIL there is a species of wasp that subdues a cockroach with two precise stings, takes it to its burrow by pulling on its antennae like a leash, blocks the entrance with pebbles, and then lays an egg inside the cockroaches’ body so that the baby wasp can feed on the zombie cockroach for days.
loGNG TIL Blue Whales are the largest animal to have ever existed on Earth, being larger than all dinosaurs, and every single big sea animal from the past
ENbo TIL that sun sneezing is called Autosomal Dominant Compelling Helio-Ophthalmic Outburst Syndrome and not everybody has it