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TIL an undercover officer was led on a chase of a suspicious person. A CCTV officer used cameras to tell him where the suspect was at throughout the chase. After 20 minutes they discovered that the "suspect" was actually the undercover officer chasing himself at the direction of the CCTV officer.

BkLb TIL scientists attached stilts to the legs of ants to prove that ants return to their nests by counting their steps. The ants with stilts overshot their nest by roughly 50% due to the new length of their steps.
KOpv4 TIL of the Inughuit of northwest Greenland, the world's northernmost people. When contact was made in 1818 they had been isolated for several hundred years and were completely unaware of the existence of other humans.
Oo4VR TIL from the Battle of Hastings in 1066 the government of England spoke a type of French called Norman, while ordinary people spoke forms of English. Although Norman died out in England several hundred years ago, it continues in legal terms and parliament is still opened by the Queen in Norman.
gMDj8 TIL The La Danta temple in the Mayan city of "El Mirador" measures approximately 72 metres (236 ft) tall from the forest floor, and considering its total volume (2,800,000 cubic meters) is one of the largest pyramids in the world (pyramid of Cheops volume of 2,600,000 cubic meters).
ANQQx TIL In the movie Memento, only the color sequences move backward and they start off as objective. The black and white sequences move forward and start off as subjective. It all converges at the end.