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TIL out of some 45,000 known species of spiders, only 23 are considered to be quasi-social, which includes building and maintaining larger webs together. These colonies can grow large enough to even take down birds and bats.

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78bYP TIL in 1530, the chinese Ming Dynasty invented bronze-iron composite cannons. The Dutch claimed "it’s scarcely possible to find their equal outside of Ming Empire". After manchu Qing dynasty's conquest they deprioritised Gunsmithing and had to use 100-300 years old cannons against British Empire.
Wk8BN TIL Mt. Rainier is rated one of the most dangerous volcanoes in the world. It is on the list of the World's 16 "Decade Volcanoes", so-called due to their history of large, destructive eruptions and proximity to densely populated areas, threatening tens or hundreds of thousands of people.
XEmJQ TIL of the Chichijima Incident. During an air raid in Japan during WW2, 9 American airmen were shot down, with 8 of which captured, tortured and murdered (5 of which cannibalised). The only one who survived was George H.W. Bush, a then 20 year old pilot.
awye0 TIL the 2011 earthquake off the coast of Japan was so powerful - measuring almost 9.0 on the Richter scale - it moved Japan 8 feet closer to North America and shifted the planet on its axis, causing the length of a day to shorten by almost 1.8 microseconds
7XYx TIL: the first use of “Google” as a verb in pop culture (TV) happened on Buffy the Vampire Slayer in 2002