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TIL leaving lights on at night isn't actually proven to reduce crime.

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OGavg TIL the very first phone call was between the head of Motorola to his rival at Bell Laboratories to brag, "Joel, this is Marty. I'm calling you from a cellphone, a real, handheld, portable cellphone."
kJleg TIL: In 1968, over 6000 sheep were killed in Utah and popular theories pointed to the Army. It was revealed 30 years later that it was indeed the result of nerve agent testing. Families nearby developed nervous system illnesses, but the Army accepted no responsibility.
jNYjj TIL that football fields aren't flat, they are slightly curved with the highest point in the middle of the field. This is make sure rain water doesn't make puddles, and instead slide off the field.
QJ0ea TIL Steller's Sea Cow was wiped out by hunting in less than 30 years since discovered...
LQe1v TIL Disney World Resort Orlando Florida, with an area of 110km2 (43 square miles) is bigger than Paris 105km2 (41 square miles) and almost double the size of Manhattan 59km2 (23 square miles)