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TIL that John Tyler, the 10th President of the United States, has a living grandson

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nepjb TIL viruses (100nm) are smaller than the wavelength of visible light (380-740nm), so light doesn't bounce off of them. They are therefore invisible, and can only be seen with electron microscopes.
VMJd4 TIL of the Man in the Iron Mask. An unidentified prisoner held for 34 years, until his death in 1703, who was forced to wear a mask to ensure no one knew his true identity. His cell had multiple doors so no one could listen; if he spoke of anything other than his immediate needs he would be killed.
BWyr TIL that the FDA is accused of having unethical relationships with drug manufacturers, resulting in many potentially unsafe drugs on the market.
XEJmX TIL Queen Elizabeth stopped breeding corgis in 2015. She doesn’t want to leave any young dogs behind when she dies.
LkNJZ TIL that durning WW2, the US government begged housewives to not reuse bacon grease, but to turn it in. A pound of fat could make a pound of explosives for bombs. In the end, bacon helped defeat the Nazis.