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TIL to besiege an army, Julius Caesar built an 18km wall around their city. Upon learning of an approaching relief force, he built a 21km wall around the first. The armies attacked from inside the city and out, and Caesar defeated the 180k strong enemy with 60k men. The entire episode lasted 3 weeks

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work8 TIL some copies of the Toy Story 2 DVD sold at Costco in 2000 accidentally contained a scene in the middle of the film from High Fidelity where the word “fuck” was used twice.
rWR0 TIL Humans can survive indefinitely on a diet of just potatoes and butter
1ak14 TIL that the ancient Egyptians had structures marked with cubit scales—now called "nilometers"—to measure the Nile River's water level during the annual flood (the foundation of their civilization), to predict how much it would fertilize their cropland and whether the flood would be destructive.
GARy4 TIL Of the Chinese drywall health issues. Between 2001 and 2009 the United States imported large amounts of drywall from China that would off-gas, slowly releasing chemicals like hydrogen sulfide and corrode pipes. The South-East was especially affected because of rebuilding following hurricanes.
LJrV TIL in 1988 a cargo plane was trying to deliver much needed medical supplies to hurricane victims of Honduras, but the tarmac was filled with unsolicited and unneeded donations so the plane was turned away. 60% of items donated after a disaster can’t be used.