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TIL: Philadelphia's Eastern State Penitentiary, designed by the “Society for Alleviating the Miseries of Public Prisons,” so isolated prisoners that many went insane. (The 1829 castle-like complex did have better comforts than period prisons --like dependable heat. Shut: 1971, ruin-park since '94.)

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dd5K TIL that after the death of Steve Irwin, in what was speculated to be a series of revenge killings, at least ten stingrays were found dead and mutilated on the coast of Queensland
GVp5 TIL From 1998-2010, hedge funds earned $379 billion in fees, while the investors in them earned $70 billion in gains.
MWbV TIL Democritus supposed the existence of atoms and the empty space between them in 400BC
rRAbx TIL After the 2003 film The Cat in the Hat was released and panned by critics, the widow of Dr.Seuss vowed to never allow his work to be adapted in live action again.
9YWj6 TIL animals can't make vitamin D in their skin because their fur or feathers shade it from the sun. In the oils secreted on their fur or feathers are the precursors, and after vitamin D is produced they lick it up when grooming.