› added 2 years ago

99

TIL sonar is lethal. At 235 decibels, the vibrations can rupture your lungs and cause brain hemorrhaging.

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4XXvo Birds, whales, butterflies, and many other animals have an instinctive sense of which way points North. Even dogs tend to poop in line with the planet's magnetic poles. If they can sense magnetic fields, can we?
9YPKp TIL former president John F. Kennedy, after his patrol boat was rammed during WWII, swam over three miles to the nearest island while pulling an injured crewmate with his teeth.
l7XDr TIL that universal peace symbol comes up from merging letters "N" and "D" of the flag semaphore, standing for "nuclear disarmament".
jw5a TIL: 8 million years ago, Venezuela was inhabited by guinea pigs the size of tables.
BgWMb TIL That the largest group of ethnically Japanese people outside of Japan is in Brazil.