› added 3 years ago

138

TIL that the Great Wall of China, stretching over 20,000 km (13,000 miles) and built over centuries, never effectively prevented invaders from entering China.

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VMeGk TIL that DisneyWorld was designed to be inhospitable to mosquitoes. Disney also stocks its ponds with mosquitofish that eat mosquito larvae in the water.
D1WkV TIL about Florida stone crabs that are caught in traps, the claw ripped off and the crab tossed back into the ocean to grow a new claw.
99WB TIL Tin Foil Hats actually amplify, not protect one’s brain from radio waves.
g9dL TIL the American government can classify your invention as “born secret” and keep it from the public
6EQZY TIL that one of the cities which is hosting the 2022 FIFA World Cup in Qatar isn't even built yet.