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TIL a Czech brewery employs crayfish to monitor water quality. The crayfish are fitted with high-tech sensors that monitor their movement and vitals. Any changes in the crayfish's condition or behavior alert the brewers to possible water issues.

Read more reuters.com

via reddit.com

QJR5E TIL of an organization in Belgium training giant rats (nicknamed "HeroRATs") to sniff out landmines in countries where explosive remnants of war pose a large threat to communities. The rats are extremely effective, outperforming both metal detectors and bomb-sniffing dogs.
8aX4P TIL that Nathan "Nearest" Green, a slave, taught Jack Daniel how to brew whiskey. He became Daniel's Master Distiller, and is now known as "The Godfather of Tennessee Whiskey." His son George also became a Master Distiller and some of his descendants STILL work for Jack Daniel's Whiskey to this day.
LMVv TIL Switzerland has a functioning system of direct democracy, and it’s the only one the world.
d8m4Q TIL that Harrison Ford, who'll play Indiana Jones in a 2021 sequel, is actually a year older than the actor who played "old" Indy on the 1990s TV series "The Young Indiana Jones Chronicles."
QNx66 TIL Napoleon indirectly began the process of Latin American independence when the power vacuum was filled by local politiccal. Such leaders embraced nationalistic sentiments influenced by French nationalism and led successful independence movements in Latin America.