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TIL Carlsberg Laboratory, owned by the Danish brewer, was where the pH scale was invented, and where the first stable commercial beer yeast was isolated (Saccharomyces pastorianus/Saccharomyces carlsbergensis), along with many other scientific innovations

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Bg6Rd TIL that during World War II, the British Royal Navy used specially trained dolphins to detect underwater mines and enemy submarines.
kORw4 TIL that a baby elephant struck by a motorbike while crossing a road in Thailand survived after an off-duty rescue worker performed CPR on it. The man had worked in rescue for 26 years and performed dozens of CPR attempts on humans, but the elephant was the first victim he had ever managed to revive
dLAQ TIL Nestle promised none of their products would be made using child slavery by 2005. When the deadline was reached and it was found they did not keep their promise, they started suing companies releasing reports about it.
Ejdw TIL the Rolling Stones were criticized for high ticket prices on their 1969 US tour so they decided to hold a free concert. The festival was organized by the Grateful Dead and took place at the Altamont Speedway in 1969. It was a disaster, and signalled the end of the hippie movement.
jNJmX TIL about the PayPal Mafia. The original group of PayPal founders and employees who have gone on to become one of the most successful groups of individuals in the world. The portfolio of companies they've founded includes; Tesla, Youtube, Space X, Linkedin, Yelp, and Founders Fund, to name a few.