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TIL That there's a mysterious rare polio-like illness paralyzing little children. Its cause is unknown, and there is no treatment or cure. It spikes in cases every other year.

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grAGL Today I learned Zambia, I country in Southern Africa tried to go to Mars in an oil drum
1aYwX TIL about the Faint young Sun paradox that in Earths early history the energy output of the Sun was only 70% of what it is today, yet earth had liquid water and a climate hospitable to the formation of life, rather than the frozen environment that it should be with the Sun's reduced energy.
8aBpX TIL the definition of grams and kilograms have been flipped; the kilogram is the SI unit of mass, and the gram is defined as 1/1000th of a kilogram.
5YvPR TIL that Paul Revere was one of America's first orthodontists, and used walrus teeth as dental implants. The walrus teeth were later helpful for identifying the corpses of his patients that were killed in the Revolutionary war.
b98KE TIL Every 4th of July The Philadelphia Liberty Bell is tapped (not rung) 13 times to honor the 13 colonies