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TIL there is a species of flatworm that after sex, if the female has been filled with unwanted sperm from an undesirable partner, it can double over, put its mouth over its genital opening, and suck the sperm back out. This gives the female control over who fertilises her eggs.

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ZpaQD TIL - The 'Blood Falls' in Antarctica is a bright red waterfall that flows from the Taylor Glacier into Lake Bonney. Despite its eerie appearance, the red color is actually caused by iron oxide, which gives the water its rust-like hue. The water is also extremely salty, preventing it being frozen
rNOBW TIL every five seconds between lightning and thunder is about a mile of distance; it’s not true that each second between lightning and thunder means the storm is one mile away
lw9A TIL Poverty Kills More People Every Year Than Either Of the Top Killers – Heart Disease or Cancer
JYrWm TIL about Hasekura Tsunenaga, a samurai who dazzled the king of Spain, set up diplomatic links with 17th-century Europe and even met the pope.
YM6A TIL Ernst Leitz II risked his own safety by putting into place a wildly successful plan to help Jews escape Nazi Germany. He hired Jews, and then sent them on foreign assignments.