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TIL the white noddy or fairy tern, native to tropical Pacific islands, is notable for laying its egg on a bare branch in a small depression without a nest. It is also considered one of the most useful of land-finding birds to mariners since these seabirds generally roam within 45 km of their island.

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KJ8E TIL there’s a series of 70-foot-long concrete arrows that bisects the country longitudinally all the way from SF to NYC, all designed to direct aerial traffic. They are from the pre-digital age and were installed by the Federal government in 1924, coupled with light signals to guide the way.
d8ogK TIL of Henry de Bohun, a brave knight who thought he could kill Robert the Bruce on the open field because the King of Scots was armed only with an axe. Robert regretted the incident because he broke his favorite axe splitting Henry's head.
D1rNe TIL that when Eli Wallach, who played "The Ugly" in "The Good, The Bad, and The Ugly," arrived in Madrid to shoot the movie, all hotels were full. He ended up having to sleep in the same bed as Clint Eastwood and later often bragged that he was the only man who ever slept with Clint Eastwood.
Lv7Z TIL that in 1746, Jean-Antoine Nollet conducted an experiment in which 200 monks formed a circle (1.6 km in circumference) and were linked by iron wire. He then had electricity pass through them which shocked all the monks simultaneously. He concluded that the speed of electricity was very high.
DeyV TIL: If you search Google maps for Yucca Flat Airport and zoom out, you can see dozens of nuclear bomb craters from underground testing