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Gravitational waves — ripples in the fabric of space-time — are a big deal in the world of science. Here's a video that helps explain how they work.

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J1Ln1 TIL the country with the most French speakers isn't France but the Democratic Republic of Congo. Likewise, there are more French speakers in Kinshasa than in Paris Of the 212 million who use French daily, 54.7% are living in Africa.
yVPAl TIL: Ant corpses release a chemical when they die, and other ants will dispose of the corpse. A scientist once recreated this chemical and put it on a live ant. Its ant friends kept bringing it to the graveyard no matter how much it struggled, cleaned itself, or tried to go back to work.
Oow86 TIL that in 1961 an aircraft crash nearly set off a nuclear detonation 250x the size of Hiroshima in North Carolina. The only thing that prevented it from going off was a simple low voltage safety switch.
epEQD TIL that any shape made entirely of straight lines can be made from a folded piece of paper and a single straight cut. (Fold and cut theorem) (VSauce short)
M7Ylm TIL that Genghis Khan strategically married his daughters to allied kings, sending the sons-in-law to fight in Mongol campaigns. As many of them died in battle, his daughters took control, effectively ruling those nations.