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TIL that WHAM-O's Slip N' Slide is not supposed to be used by persons over the age of 12. There have been rare instances (and lawsuits) of adults breaking their necks while using it and in 1993, the U.S. CPSC warned that the slide might cause permanent spinal cord injury to teens and adults.

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OW67 TIL James Cameron pitched the sequel to Alien by writing the title on a chalkboard, adding an “s”, then turning it into a dollar sign spelling “Alien$”. The project received $18 million dollars.
nWlJB TIL We could kill all mosquitoes with little to no effect Ecology: A world without mosquitoes
Bgp6K TIL cows don't have upper front teeth, instead they have dental padding, which helps them hold on to more gras while grazing
9Q66 TIL Lawns have been a sign of great wealth since the Middle Ages. Neighbors assumed you were wealthy if you had cultivated land, but didn’t have to grow food on it.
a80KZ TIL in 400 BCE Persian engineers created a ice machine in the desert.