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TIL When the printing press made its debut in Europe in the 15th century, thousands of old texts were 'recycled' for use as binding material for newer books. In 2015, researchers at Leiden University started using an x-ray technique to reveal these texts. Some are up to 1,300 years old.

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GYQG4 TIL there is a "honeymoon phase" for people who acquire a new job that usually ends after the first year of employment. Happiness levels dip after the first year, and stress levels continue to rise and rise each year thereafter.
4Yga TIL spiders can’t chew or swallow, so they inject poison into their prey which turns the insides of insect to a watery goop and spider just suck it up.
Oy4Y TIL the infamous Red Wedding, from G.R.R. Martin’s “A Storm of Swords”, was inspired by real-life events which took place at Edinburgh Castle in 15th century Scotland, known as “The Black Dinner”.
jO9M TIL at the 1956 Olympics, an Australian student successfully impersonated an Olympic torchbearer, handing the mayor of Sydney a painted chair leg topped with a pair of burning underwear in front of a crowd of thousands.
NXBXJ TIL a plane once crashed because a passenger smuggled a crocodile on board