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TIL the alignment of planets in our solar system that allowed us to launch Voyager spacecraft out of our solar system at the speed it went only happens once every 176 years

Read more voyager.jpl.nasa.gov

via reddit.com

xVa47 TIL of the Prince Rupert's Drop, created by dripping molten glass into cold water. Capable of shattering bullets on impact and withstanding the blow of a hammer, this "glass droplet" is characterized by its incredibly high residual stress.
PYOLE TIL Navajo was once in danger of losing a lot of speakers, but the Navajo nation set up programs to teach the language as well as many bilingual schools. Now there are even institutes, community colleges, and technical universities with classes in the Navajo language
5V9MB TIL that one species of jellyfish, Turritopsis dohrnii, is almost immortal. It can revert its life cycle by reprogramming its cells.
DRPD TIL that America’s first serial killers, the Harpe Brothers, were kicked out of pirate gang for being too brutal: the Harpe Brothers would throw their victims off the cliffs of Cave-In-Rock, Illinois
8a6nP TIL there is no constitutional requirement for a U.S. State to hold presidential elections. A State legislature can theoretically just handpick its presidential electors.