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TIL you mostly breathe through one nostril at a time. Every few hours, your autonomic nervous system will switch nostrils to give the another one a break!

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d8Ra7 TIL the Aztecs followed Spaniards around with incense burners when they came to the Americas. The Spaniards believed this to be a divine honour, however it was actually a necessity due to the wide gap in hygiene between the two peoples. The Aztec found their stench unbearable.
D1onp TIL Disney World has 7500 acres of empty land, stemming from a 1970 environmental promise Disney made to Florida to never built anything on it.
xe51 TIL North Korea has the 4th largest army, the largest special forces and the largest submarine fleet in the world.
AD4ed TIL the OSIRIS-REx asteroid lander did not just land on an asteroid as it flew past, it's able to return to Earth and is actively returning a sample from the asteroid and is due to land in 2023.
v147B TIL Israel has a strategy called The Samson Option. Yhe name that some military analysts and authors have given to Israel's deterrence strategy of massive retaliation with nuclear weapons as a "last resort" against a country whose military has invaded and/or destroyed much of Israel.