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TIL after the Suez Canal was completed, species from the Red Sea used it to migrate to the Mediterranean and became invasive. This phenomenon is called the Lessepsian migration, after the builder of the Canal, Ferdinand de Lesseps

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j64eR TIL Neil Armstrong received hundreds of thousands of cards and letters from all over the world after his historic moon landing. James Hansen selected 400 letters out of 75,000 for publication in a book and donated 55 hours of one-on-one tape-recorded interviews with Armstrong to Purdue’s Archives
g7b9 TIL The highest-earning female CEO in the US was born a man
QJkpd TIL That Mark Zuckerberg used failed log-in attempts from Facebook users to break into users private email accounts and read their emails.
nevl7 TIL Sleep literally cleans your brain. During slumber, more cerebrospinal fluid flushes through the brain to wash away harmful proteins and toxins that build up during the day.
16BJ4 TIL that Abe Lincoln's son represented Robert E Lee's son in a Supreme Court Case to reclaim Arlington Cemetery as Lee Jr's personal home; he shortly thereafter sold it right back to the US Gov't. The wiki chain was Band of Brothers author Stephen Ambrose -> Historian Hesseltine -> Wash/Lee Uni