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TIL: Ordinary ice is called ice Ih, because it has hexagonal crystals. But if you cool it below -37 °C, scientists believe it will gradually turn into a cubic form, called ice Ic.

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nepMB TIL the word Abracadabra was originally used in ancient Rome as a cure for malaria. It wasn't spoken as we use it today, however it was written on papyrus and worn in a vial around the neck.
E11E0 TIL that near the turn of the 20th century, the German Empire had drawn up war plans against the United States. Included were a naval blockade and land invasion.
LNEv TIL that since 1997, a team of 50 people has been building a castle in France using 13th century construction methods.
NXblP TIL before 1804, the office of the US vice-president was awarded to runner up to the presidential race
0wgmy TIL in 1848, the first bridge built over Niagara Falls was started with a kite competition. A boy flew a kite across to the river to the opposite bank. The line he used carried larger and larger cables across the river used to start construction of the bridge