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TIL the human heart generates the strongest electromagnetic field of any organ in the body, and its signals can be detected several feet away from the body using sensitive equipment

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LQKX9 TIL Alexander Grothendieck, considered by many to be the greatest mathematician of the 20th century, attempted to live on dandelion soup after his retirement to a village at the foot of the Pyrenees. Local villagers had to help him with a more varied diet.
KBQR TIL that Tokyo is protected from floods by a massive underground system of tunnels and water tanks, with 14000hp turbines that can pump 200 tons of water per second
kOMZe TIL the Ancient Greek poet Sotades made fun of Ptolemy II of Egypt for marrying his own sister. For this the poet was imprisoned. He briefly escaped before being recaptured on the island of Caunus, shut up in a leaden chest and thrown into the sea.
Ql16 TIL Hoba, the largest known meteorite left no crater on Earth. Earth’s atmosphere slowed the object to the point of terminal velocity. Hoba meteorite is also the most massive naturally occurring piece of Iron known at the Earth’s surface.
e0PkJ TIL That not everyone can voluntary make the rumbling noise in their ears, also known as voluntary control over their tensor tympani muscle.