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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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nOZW TIL that a motorway in Ireland was delayed by 10 years and then rerouted to protect a tree that was thought to belong to fairies.
wLj66 TIL that the grading system used by schools in the United States is A, B, C, D, or F because teachers were concerned that students and parents would think "E" stood for "Excellent" in an A, B, C, D, E system.
JlxV TIL John Newton, most famous for writing “Amazing Grace,” spent the early part of his life as a sailor, then captain, on several slaving ships before converting to a life of evangelical Christianity. Late in life he became an abolitionist, expressing regret that it had taken him so long to do so.
woZ8M TIL that, of the 50 oldest people on the planet, only ONE of them is a male.
Jdel TIL that Peter Brabeck-Letmathe (Chairman of Nestlé) said that the idea of water as a basic human right is “extreme”