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TIL The reason tennis balls are yellow is largely thanks to Sir David Attenborough

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rn6M TIL Heme is the iron-containing part of hemoglobin that binds oxygen in your blood. If you replace the iron atom in heme with magnesium, you get another biologically important family of compounds - chlorophyll.
Oo7eY TIL the Wayside house in Massachusetts was home to three writers: Louisa May Alcott, Nathaniel Hawthorne, and Margaret Sidney
pRMZ TIL on the first splashdown by a Soviet crew, the Soyuz capsule landed in the middle of blizzard ,punched through a frozen lake, went fully underwater and the lake above them froze over partially requiring an intense rescue operation lasting 9 hours under −22 °C.
aa6A TIL Mike Tyson has coped with negative emotions throughout his life by caring for pigeons. As a child he suffered bullying & depression (the first punch he ever threw was at a bully that killed one of his birds) & as an adult with his sunk career and death of his 4 year-old daughter.
QJZZL There are 70 coronavirus vaccines in development globally, with three candidates already being tested in human trials, according to the World Health Organization,