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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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BrEPb TIL research reveals slow left lane drivers are spiking accident rates. Slowing down and changing lanes multiple times can be far more dangerous than speeding, causing almost 10 percent of highway accidents. Some drivers are misguided in believing they are keeping people safer by slowing traffic
gMZyA TIL there is a Museum of Failure in Sweden, showcasing a collection of failed products and services from around the world.
LkZ5Q TIL of a population of Russian brown bears which appear to have become addicted to huffing gas fumes. The bears will sniff the fumes and then dig a shallow hole to lie down in.
Vbg4 TIL If you take all the DNA in your body and line it up to form one long strand, it would measure to be 135 trillion meters long. It would be able to wrap around the Earth’s equator 2.5 million times or about twice the diameter of our solar system.
epn4k TIL that in 1944 a Sci-fi writer wrote a short story describing nuclear bombs and their construction methods called "Deadline". It was so accurate that the Counter intelligence Corps feared a leak or spy on the Manhattan Project. In actuality the info was always there in public scientific journals.