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TIL that suppressing a sneeze can damage your eardrum or damage your blood vessel in your brain. It can at times even lead to death.

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wKJM TIL that in WWII, an Australian Army nurse was shot during the Banka Island Massacre and feigned death until the Japanese soldiers left. She then rescued another injured survivor and nursed him back to health.
nOEY TIL Roman aqueducts took into account the curvature of the Earth.
VMkPD TIL that 10% of ancient tools uncovered are designed for being left-handed, indicating that in the last 10,000 years the proportion of the population that is left-handed has remained consistent at 10%.
WkMko TIL Charles Darwin & his wife were first cousins. They had 10 kids, 7 making it to adulthood. Worried that his marriage had something to do with the deaths, he began to experiment with plants. He learned that with any kind of breeding, it's better to cross-breed than to keep relatives together.
KOrkw In 1965, a Japanese company called Yamasa Clock created a personal-fitness pedometer called the Manpo-kei, which means “10,000 steps meter.” The Japanese character for 10,000 looks almost like a person walking or running, which is likely how the gadget-maker landed on the name—and the number. It’s also an easy goal to remember, especially when accompanied by a sketch of a person who’s literally walking. But that benchmark wasn’t based on any scientific evidence. There's no magic number of steps that can ensure your heart health.