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TIL sound travels at 343 m/s in air, 1,481 m/s in water (almost 4.3 times as fast) and at 5,120 m/s in iron (almost 15 times as fast) and in diamond sound travels at 12,000 metres per second (39,000 ft/s),[2]— about 35 times its speed in air because of how exceptionally stiff diamond is.

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0wEwA TIL the left and the right only believe facts that follow their conditioned narrative, and completely silence, deplatform or block truth and factual information they oppose.
R7pol TIL iodine was added to salt in 1924 to combat goiters, but the iodization also resulted in notable increases in intelligence
kOrw4 TIL there is an island in the pacific called Yap that uses circular stones as currency. The stones are too large to move so the ownership of the stones is passed by word of mouth to transact business. The location of the stone is irrelevant even in the case of one lost on the bottom of the sea
rNkbe TIL that the largest cavalry charge in history happened at the Turkish seige of Vienna. Commanded and led by the King of Poland, 18,000 German and Polish horsemen charged at the Turkish line, destroying the invading Ottoman army. The battle is thought to have ended the Islamic invasion of Europe.
0dGwN TIL that Texas used to be part of Mexico until 1836. Then it became an independent country for 9 years before being annexed by the United States in 1845.