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TIL that today, from 6:02 am to 6:02 pm on October 23, is unofficially recognized as Mole Day by chemists (in honour of 6.02x10^23 atoms present in one mole of a substance).

Read more chemistry.about.com

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b9WNj TIL in 2012 the town of Dull (Scotland) was paired as a twin-town with Boring (Oregon, USA). Later, in 2013, they were joined by Bland (Australia) and the three now form the "Trinity of Tedium", officially the "League of Extraordinary Communities".
8aRva TIL A bank robber hired decoys on Craigslist and escaped down a creek on a Inner tube
b9OrQ TIL that in 1996 a stray cat who'd given birth to a litter in an abandoned Brooklyn garage returned to the structure five times after a fire broke out to save her kittens, despite her eyes blistered shut and her paw pads burned from the flames. (Mama and babies all survived.)
9Y096 TIL that male bower birds build very creative and elaborate bowers for females to inspect during the mating ritual. It takes them between 1 week and 2 months to finish the bower and some have been maintained for 30 years. As decoration they use small items such as pebbles, shells and small flowers.
j6oBv TIL: Rum is subsidized by US taxes