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TIL snails, which are hermaphrodites, have sex by first stabbing each other with a tiny spike called a love dart, which determines who is more likely to be the 'male' in the exchange (the better stabber). Scaled to human size, the dart would be a 15-inch knife.

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RBml TIL that Tom Hanks in Castaway allowed himself to gain weight to fit the role of a middle-aged man. Production was then halted for a year so he could lose 50 pounds and grow out his hair for his time spent on the island. During the hiatus, Robert Zemeckis used the same crew for What Lies Beneath.
4klER TIL that since it's discovery in 1930, Pluto has still yet to complete a full orbit around the sun, and will only do so by 2178.
OV9g TIL that only 59% of people voted in favor of repealing the ban on interracial marriage in Alabama in 2000
QGrE TIL When you measure the test scores of USA schools with a child poverty rate of less than 20%, those kids outperform every nation in the world.
PYnvO TIL that the zipper on many jeans will lock in place if you fold the tab down and press it against the teeth.