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TIL that some Paramecium contain kappa particles. These are actually symbiotic bacteria that produce a toxin that kills Paramecium that lack kappa particles.

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R9w9 TIL A man named Charles Holden picked up a hitchhiker, got into a fight with him and ditched him ½ mile away from his house. Later this hitchhiker walked up to a house and killed an elderly woman. This woman was Charles’ mother. The hitchhiker didn’t know they were related.
4Xnnw TIL that in Victorian London, mail was delivered to homes 12 times a day. "Return of post" was a commonly used phrase for requesting an immediate response to be mailed at the next scheduled delivery. It was quite common for people to complain if a letter didn't arrive within a few hours.
VMogQ TIL that Johnny Cash's estate had to turn down an ad campaign to use Ring of Fire for hemorrhoid-relief medication
pQee TIL that sex workers in Australia can claim dance lessons, lingerie and costume makeup as tax deductions. Vibrators and fetish equipment can also be claimed, but as depreciating assets.
1ajed TIL william lever, founder of sunlight soap which later became Unilever, collaborated with belgian congo and used forced labor.