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TIL flamethrowers could only fire for about 7 seconds before running out of fuel.

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KOoa9 TIL, numbers that are the product of two prime numbers (e.g. 4, 6, 9, 10, etc.) are called semiprimes, and sometimes they can be the squares of prime numbers. Semiprime numbers have no composite numbers as factors other than themselves, which is another reason why they are called semiprimes.
ko1 TIL that, in 1958, an economic campaign to modernize China resulted in the deaths by starvation of +18 million people. During this time, China was actively exporting food to Africa and refusing any foreign food aid.
xxGw TIL of Gate Control Theory which explains how rubbing an injury closes nerve gates and in turn reduces pain.
OoLo6 TIL that author H. G. Wells was a pioneer in miniature wargaming. In 1913 he published Little Wars, a rulebook for playing out battles using toy soldiers.
OGYLR TIL In the month after media coverage of plane accidents, road traffic and road accidents in the U.S. increase. For every article published about a plane accident in a major news source, 1.3 additional road accidents happen the next month.