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TIL the oldest woman to climb El Capitan is the mother of Alex Honnold (of Free Solo fame) who did it at the age of 66. Her first time in a climbing gym was when she was 57.

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p8kxQ TIL of Gan Ying, a Chinese envoy who in 97 AD was sent on a diplomatic mission to Rome. He would turn around in Mesopotamia, discouraged by sailors who gave him a lengthy estimate on a sea voyage. Unknown to him Parthia shared a land border with Rome, which was only a months travel away from him.
ADJXx TIL a Danish company modified a version of thale cress (plant), that changes from green to red when being near landmines, because of the nitrogen dioxide gas released from landmines. This way you can detect landmines and save lives.
4Rg6 TIL China killed at least 800,000 of its own citizens when it purposefully opened dikes to flood the Yellow River.
4WVN TIL a small town in Minnesota declared war on the United States.
oReZL TIL During the 1800s, Hawai‘i became one of the most literate nations in the world with over 90% of the population able to read and write. Even King Kamehameha III proudly declared, “He aupuni palapala ko‘u” (“I have a kingdom of education”).