26Apes sleep
One of the key differences between monkeys and apes is how they sleep. Monkeys sleep in an upright position and have a light sleep. Apes like to lie down and enter into a deep sleep. The deep sleep in apes is believed to have improved cognitive ability in them.
27. English pirate Blackbeard and his crew would lock themselves in the hold of the ship and light pots of sulfur to see who could last the longest without suffocating.
28. German philosopher Friedrich Nietzsche criticised antisemitism and German nationalism, believing in his final years he was "a pure-blooded Polish nobleman, without a single drop of bad blood, certainly not German". He claimed he and Germany were great thanks to "Polish blood in their veins" and wanted "all antisemites shot".
29. The BBC used the opening bars of Beethoven's Fifth Symphony during World War 2 because it simulated the Morse Code "V" for Victory.
30. Texas is the only state in USA with its own power grid, the Texas Interconnected System, which is therefore not subject to federal interstate regulations.
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31Week
The fact that there are seven days to the week, internationally, and that the Sun day is followed by the Moon day, happened thanks to ancient Mesopotamia or Egypt passing it on to Greece, Rome, India, Japan.
