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TIL: Cultured pearls may have only 0.5 mm of pearl on a resin bead

Read more pearls.co.uk

via reddit.com

rNVLd TIL that PET scans work based on antimatter. The patient is injected with a radioactive material that generates positrons, which annihilate with electrons in the patient’s body. The PET scanner detects the gamma radiation that’s generated.
QNyP9 TIL that until the early 1920s, most astronomers thought that the Milky Way contained all the stars in the Universe
bDn0 TIL in Arthurian legend Arthur’s helmet was called ‘Goosewhite’, his lance was called 'Ron’ and his battlecry was 'Clarence!’
4XpGX TIL About Leslie 'Bull' Alan who carried twelve men to safety from Mount Tambu described as 'a gigantic man striding up Mount Tambu like he was on a Sunday jaunt'
woJBM TIL that women tend to outlive men by an average of 7 years worldwide.