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TIL brass doorknobs disinfect themselves in about eight hours.

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Rx1l TIL that two-thirds of all $100 bills are circulated outside of the United States.
5YoGD TIL the word 'millionaire' is a French word coined in 1719 to describe those working in the Mississippi Company earning millions of livres which is one of the earliest examples of an economic bubble
WvRY TIL that a StingRay tracker mimics a wireless carrier cell tower in order to force nearby phones & cellular data devices to connect to it then it can extract & write to metadata on your device and an operator can conduct specific surveillance operations on just the target device; and it’s legal.
yQG5X TIL the Black Death was originally spread to Europe in the 14th century by Mongols catapulting infected corpses into an Italian trading outpost in Crimea, who fled and unwittingly carried the disease back to Sicily where it proceeded to wipe out up to 60% of Europe's population in four years
N7GnQ TIL that in the 1800s, one of the most popular sports in the world was distance walking which attracted huge crowds and gambling. Thousands of spectators would turn up to watch challenges such as walking 1,000 miles in 1,000 hours.