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TIL about a population of Greater Rheas (Nandus) that established itself in Northern Germany after 7 birds escaped a farm in 2000. As of 2018 their number has reached as many as 566

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69Bj8 TIL Vancouver's Stanley Park Hollow Tree Conservation Society voted to save a six-metre-wide dead Hollow Tree stump and paid $200,000 worth of restoration work. The parks board voted to cut down the 700 year old tree, because it was a safety hazard
wL4KW TIL in 1887 contact lenses made of blown glass were invented, and were so heavy they could only be worn for a few hours.
pYObe TIL that a concussion doesn’t always cause unconsciousness. Most people never pass out. They may describe seeing all white, all black, or stars.
4ymg TIL The White House has an estimated market value of over $390 million, and would cost $2 million a month to rent.
VMgR8 TIL that 'Moron', 'Idiot', and 'Imbecile' were once valid Psychology terms for people with low IQ. When these terms entered vernacular usage as insults, they were disused in favor of 'Mental Retardation' which in turn was disused in favor of 'Intellectual Disability'.