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TIL a woman has Chimerism: she's a fraternal twin who fused together with her sibling in the womb. Now she has 2 different immune systems and 2 different bloodstreams. Her immune system's constantly fighting off her twin sister’s cells, as it recognizes them as foreign, causing autoimmune issues.

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gMJbW TIL the Methuselah Tree, named after the Biblical figure who was said to live 969 years, is a nearly 5,000-year-old bristlecone pine near Death Valley believed to be the second-oldest tree on earth.
y4LV TIL Gordon Northcott, who molested and murdered several boys in the 1920s, and the movie The Changeling is based on, upon the day of his hanging asked, “Will it hurt?” To which the guards replied, “No one’s ever complained.”
ANYAx TIL that the first commercially successful video game - an Atari Pong cabinet at Andy Capp's Tavern in Sunnyvale California in 1972 - got a complait for beeing "broken" when it was jammed out of order with quarters due to its unexpected popularity
Lk050 TIL of co-emperors Caracalla & Geta,who hated each other.At a meeting set by their mother, Caracalla had Geta killed.Caracalla then killed any who knew Greta.Over 20,000 were killed.It became a capital crime to even say "Greta".Years later he sacked a city because they held a satire of the murder.
QMwe TIL that WWE superstar John Cena has granted over 300 wishes for the Make-A-Wish foundation.