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Today I learned that in ancient Egypt there were structures now called Nileometers used to monitor flood potential of the Nile. They did this to predict harvest quality, flood danger, and to keep an eye on water clarity.

Read more wikipedia.org

via reddit.com

P1J4J TIL about Sikh Nation - the largest blood donation campaign run by Canadian Sikhs to commemorate the tragic loss of thousands of lives in India’s anti-Sikh genocide in 1984. It has saved more than 160,000 lives and spread to 27 communities across the country since it began in 1999.
W7ZrY TIL that legal poppy farmers in Tasmania couldn't figure out why they kept getting crop circles until it was revealed wallabies were breaking in to eat the bulbs to get high then running around in circles trampling the flowers
76gr TIL that the city of Pompeii was covered in graffiti, including one case saying “Weep, you girls. My penis has given you up. Now it penetrates men’s behinds. Goodbye, wondrous femininity!”
np6P TIL that if you’re behind a firewall like in Iran or China and can’t download Tor, you can send an email to gettor@gettor.torproject.org with the subject “help” and get a download via email with step by step instructions.
e0gXg TIL that in 1978, and architecture student discovered the Citigroup Center in NYC was susceptible to strong winds due to it being on stilts. Renovations to address the issue were done during a newspaper strike at night while employees were at home. This work was largely unkown unknown until 1995!