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TIL that a component of the immune system is defensins ('defense' + '-in', which is the suffix for anything protein related). They are proteins with antimicrobial properties and can kill microbes directly, which can be an alternative for antibiotics.

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dpL9 TIL that Einstein and his wife once visited the enormous Mount Wilson Observatory with astronomer Edwin Hubble. When told that Hubble’s telescopes were revealing the ultimate shape of the universe, Einstein’s wife nonchalantly responded, “Well, my husband does that on the back of an old envelope.”
YpWOB TIL Korea's Royal Palace was burnt down during the 1592 Japanese invasions and left in ruins for over 250 years. It was rebuilt in the 1860s but later destroyed by Japan to build the colonial government building in its place. As of now, work has been ongoing for over 4 decades to restore the site.
J1d9j TIL that on Jupiter's moon Io, tidal effects from Jupiter cause the ground itself to move up and down by 300 feet. Typical tidal range on earth is 3 feet in the open ocean.
GA5jE TIL the Moon has a smell—like burnt gunpowder. Apollo astronauts noticed it after taking off their helmets inside the lander. The weird part? Lunar dust has nothing in common with gunpowder. Scientists think it reacts with oxygen, but the smell disappears on Earth
5V7Pr TIL A shipyard worker set a fire aboard a nuclear submarine, causing $450M worth of damage because he was suffering from an anxiety attack and had no vacation or sick leave remaining. He was sentenced to 17 years in federal prison and ordered to pay $400 million in restitution.