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TIL A mother whose daughter was having brain surgery, called the Mister Rogers Neighborhood studio to ask for a signed photo. After hearing about this, Mr Rogers flew to the hospital to see her. His only request was that there was no press.

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4yMa TIL that in 1961, one giga FLOPS would have theoretically cost $8.3 trillion USD (adjusted to inflation) whereas today one giga FLOPS costs 8 cents.
aaGy TIL reindeer are one of the only mammals that can see UV light, allowing them to see lichen, polar bears against the snow, and urine trails
yQoXw TIL that the measly 20W signal from Voyager 1, the equivalent of a fridge light-bulb, can be distinguished from background radiation in the sky almost instantly, despite being 11 billion miles away
oe48 TIL the founder of Pringles is buried inside of a Pringles can.
QJayL TIL the Cave of Swallows in Mexico is the largest cave shaft in the world, being almost 1,000 feet wide at the bottom and 1,100 feet deep, and it's home of many birds, but despite its name, almost no swallows