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TIL that people without light stimulation from the sun (i.e. in a cave) tend to have a 48 hour sleep-wake cycle

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vPyk8 TIL That following his NASA career, Homer Hickam, known for the movie October Sky, about his teenage exploration of rocketry, became a successful dinosaur hunter, and has discovered, or has helped to discover, 5 of the 40 fossilized T-Rex skeletons ever found.
Oxp6 TIL that due to their similar protein composition, blood can be used as an egg substitute in baking and making ice cream.
RjP6 TIL of the assassin Balthasar Gérard and his brutal execution, involving having his right hand burned off with a red-hot iron, his flesh torn from his bones with pincers, quartered and disemboweled alive, his heart torn from his chest and flung into his face, and finally his head chopped off.
6EkwQ TIL that in 2019, for the first time in over sixty years, the United States exported more energy than it imported.
VbRB TIL that research has found that everyone is able to sing well - it is a learned skill that gets better with practice and worse with disuse.