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TIL that RH null is a blood so rare, only 40 people in the world have it. It's a universal donor among many people with other rare blood types, and as such has been called the "golden blood" because its life saving capability is enormous.

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4Rw6 TIL that certain frequencies of infrasound ~20 Hz can cause disruptions in human perception because they resonate the eyeball and cause hyperventilation. People have reported being haunted by “gray masses” that were later explained by the presence of low-frequency machinery.
86y4 TIL Kim Jong Il once tried to solve North Korea’s food shortages by breeding giant rabbits. A German farmer sent them 12 giant rabbits to get started, but later learned all 12 were eaten at Kim Jong Il’s birthday party.
b61Q9 TIL that tuberculosis influenced Victorian fashion, a trend known as 'consumptive aesthetic' saw women use makeup to replicate the rosy cheeks and pallor associated with TB
ADy7w TIL that in 2015, a German court ruled that men have a right to pee while standing up, rejecting a landlord's claim that his marble floor had been ruined and leading to the creation of a new German word, "Sitzpinkler" (those who pee while sitting down).
neAJG TIL a large amount of Japanese companies are owned by 'Keiretsu', mega conglomerates of companies historically run by families. One of these Keiretsu, Sumitomo Group, owns Mazda, NEC Corporation, and Nippon Steel, and traces its history back to a Copper Refining business started 1615.