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TIL that in the Victorian period arsenic colours (which could and did kill) were used to dye consumer goods, from food coloring to baby carriages.

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gMl8y TIL Norbert Pearlroth was the silent partner of Ripley's Believe It or Not. He was the soul researcher, answering 3000 letters a week, examining 7000 books a year, spending 10 hours a day, six days a week at the New York Library, and fluent in 14 languages. He produced 24 items a week for 52 years.
0dAbp TIL The proposed Helsinki-Tallinn Railway Tunnel, when completed, will be the largest underground tunnel in the world. It will help to reduce time to cross the current Gulf of Finland route from two hours to approximately 20 minutes.
X041E TIL that in 2000 it was estimated that between 230,000 to 284,000 iatrogenic deaths occurred annually in the USA.
VMVL8 TIL: in 1665 Cambridge University temporarily closed down due to bubonic plague and encouraged professors to escape to the less densely populated countryside. Issac Newton returned had to work from home, and he used this time to create calculus and the theory of gravity.
OokW1 TIL "Pulling out all the stops" comes from organ-playing meaning "bring into play every rank of pipes"