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50

TIL not long after the Vietnam War, Vietnam’s army invaded Cambodia and stopped a genocide.

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4A7N TIL that immediately after the founding of Israel on May 14, 1948, before their defense force was even founded, five Arab nations (Egypt, Iraq, Syria, Lebanon, and Jordan) declared war on it
b1oQ TIL in 2015, FBI hair examiners knowingly gave erroneous testimony; they overstated results to benefit the prosecution in 95% of cases over previous 20 years.
LMDr TIL James Doohan (Star Trek’s Scotty) saved a fan from suicide. After receiving a suicide note, he convinced her to attend his next convention appearance. Later he discovered his encouragement had not only saved her life, but also inspired her to go back to school and become an electronics engineer.
NXXbb TIL that Alzheimer’s disease can be caused by a brain immune response to herpes infection. This theory dates to the early 1900s, but was ignored because the scientist was Jewish, while Alzheimer, who named the disease, was German.
a86Q0 TIL certain species of wild oats are able to walk. They have a pair of 'legs' called awns which flex and make the seeds crawl around, to find an ideal place to plant itself.