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nih.gov
W7w6L
TIL: Researchers found in 2021 after an experiment with red haired mice given the MC1R gene that redheads experience pain differently having higher pain tolerances. The MC1R gene produces more pheomelanin which causes freckles, heat sensitivity, red hair, and suppresses pain receptors.
epmy5
TIL that bacteria outnumber human cells in an adult human body by a ratio of 10:1 although these bacteria account for only about 1 to 3 percent of the body's mass
oRKEA
TIL that donated organs are constantly attacked by the recipient’s immune system, which can age them faster, and that immunosuppressive drugs are needed to avoid rejection and infection.