› added 4 years ago

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TIL Urine contains nitrogen, phosphorus and potassium—key nutrients that plants need to grow. Researchers have been studying the removal of bacteria, viruses, and pharmaceuticals in urine to improve the safety of urine-derived fertilizers.

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9Y5Xp TIL the majority of pearls come not from wild mollusks, but from farms where grafts are inserted into mollusks as a base for the formation of these "cultured" pearls.
O9gg TIL that Mao Zedong killed more people than Hitler and Stalin together.
xVOKk TIL that red dwarf stars can host life, will live trillions of years, and none have been witnessed as dying since the big bang
8eEyG TIL unprotected sex with an HIV-positive person who has acute HIV infection could carry a transmission risk of up to 2% (the equivalent of 1 transmission per 50 exposures) for receptive vaginal sex and over 20% (equivalent to 1 transmission per 5 exposures) for receptive anal sex.
R5n69 TIL: about explosion welding. First observed during WW1 when shrapnel wasn't just stuck but welded. Now done in controlled sheets for comercial material.