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TIL: PRISM is a code name for a program under which the United States National Security Agency (NSA) collects internet communications from various U.S. internet companies.

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167XX TIL Horses in herds will often have a “guard horse” stand watch while others lay down to sleep
QmYX TIL in the late 1990s, certain digital cameras used 3.5-inch floppy disks for picture storage
dOVK TIL: tradition says that when entering a house or any other building, samurais had to leave their katana with a servant, but the wakizashi (a shorter katana) could be worn at all times and places. This is why the wakizashi is often called the samurai’s side arm
KZm6 TIL that although lead paint was recognized as toxic as early as 1897 and banned by the League of Nations in 1922, the US did not ban lead paint until 1971.
yQKyw TIL that a massive solar flare in 2012 barely missed earth (by mere days). Had it hit, the power grid would likely have failed, causing unprecedented devastation. Scientists recently determined that it was of similar magnitude as the 1859 Carrington Event.