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TIL that the level of difficulty of a mental task, from working on a complex calculus equation to completing a simple game of Sudoku, barely alters the amount of energy the brain consumes while completing the task.

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7m9r TIL that shards of obsidian, or volcanic glass, can be refined to have a cutting edge only 3 nanometers thick. This is over 1300 times thinner than some scalpels.
LLVd TIL of Tibor Rubin, a Hungarian Jew who survived Mathausen concentration camp, was deliberately given dangerous assignments by an anti-Semitic sergeant in Korea, and spent 30 months as POW after being captured by the Chinese.
J4jv TIL John Lennon was a wife beater.
n1Ar TIL in their latest film ‘Kubo and the Two Strings’ stop motion animation studio LAIKA used 3d printing for the Kubo character giving him 11,007 unique mouth expressions and 4,429 brow expressions, allowing for over 48 million possible facial expressions.
eRB4 TIL a US army Sgt. single-handedly held off 30+ men alternating between a M16 and sniper rifle, and when rescued, opted to stay behind to defend his immovable injured comrade