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TIL A man bought an unattractive painting for its frame for $4 and discovered one of the 26 known copies of the United States’ Declaration of Independence hidden behind it. He later sold it at auction for $2.42 million.

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neWJd TIL that banging your head against a wall burns 150 cal per hour
neYVP TIL about Lepersonnite, an extremely rare rare earth mineral only found in Shinkolobwe deposit in the Democratic Republic of the Congo. It is the only mineral in which the chemical element Gadolinium, otherwise too reactive to exist, is found in nature. 400 tonnes of Gadolinium are produced yearly.
VwQ0 TIL Hummingbirds have such a high metabolism that they are continuously hours away from starving to death
DQe4g TIL Vecihi Hürkuş was the first person to ever build an airplane in Turkey. When the plane was completed Hürkuş flew it for 15 minutes but was arrested by flying without a permit.
XPYQ TIL Einstein was an outspoken socialist and believed socialism was the natural course society would take.