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435

TIL that rats giggle when tickled, but only if they're in a relaxed mood

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BrR1b TIL when Robert E Lee surrendered to Ulysses S Grant, both men were so respectful and courteous that it became known as "The Gentlemen's Agreement". The two reminisced about their shared experience in the Mexican war for 25 minutes before even discussing the surrender terms.
0wj6M TIL of the Ozark Hellbender salamander, aka the Snot Otter, Lasagna Lizard, or Grampus. At 3-5 lbs with undulating skin, it reminded settlers of "horrible tortures of the infernal regions." But now it's endangered (only 590 left), so to raise awareness, Pennsylvania made it their state amphibian
4kR7R TIL although noble gas are generally inert, compounds of these gas have been observed in some cases such as XeF4, KrF2 and RnO3
BrWGr TIL that the Milky Way galaxy is located in a comparatively empty region of space known as the KBC Void. At approximately 2 billion light-years in diameter it is the largest known void in the universe
KOMaw TIL in 1993 an American spelunker found evidence of people living in 2 Ukranian caves during WWII. It was 1942, when a group of families survived the Holocaust by seeking refuge in the caves. Nearly 2 years later, someone left a bottled message alerting all of them the area was safe from Nazis.