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TIL The US Army Engineer Corps drained the Niagara falls in 1969.

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kO67B TIL the hairy frog aka the wolverine frog gets its name from its behavior of breaking its own bones and sticking them out out of its skin to use as sharp weapons. It is the only known animal with this behavior.
M7KWb TIL that in 1868 the first non-electric gas-lit traffic light was installed in London outside the Houses of Parliament to control the traffic in adjacent streets. Its operational life was brief: it exploded a month later as a result of a leak injuring the policeman operating the traffic light.
x60xw TIL that "tit for tat" is not just a saying, but also a highly effective strategy in conflict resolution, which involves being nice, forgiving, provocable, and clear. It won two "prisoner's dilemma" tournaments by simply cooperating first, then subsequently mirroring their opponent's previous move.
9MYQ TIL that the Hawaiian island of Niihau has a population of 130, comprised of native Hawaiians. It is closed off to non-Hawaiians with the exception of a few tours and hunting safaris. On the island they speak Hawaiian and at the school they are taught to survive off of the island’s resources.
OGnKa TIL the aptly named HMS Revenge (1577), after being captured in battle, perished in a storm near the Azores. An estimated 200 Spanish sailors who captured it were lost.