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TIL carpenter bees come in an adorable blue species.

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VmE4 TIL in 1973 the AAMR changed the threshold for mental retardation from IQ via http://www.reddit.com/r/todayilearned/comments/2qlbm0/til_in_1973_the_aamr_changed_the_threshold_for/
MeZkK TIL Tropical rainforests cover less than 3% of Earth's area, yet they are home to more than half our planet's terrestrial animal species. Bengal tigers, mountain gorillas, orangutans, jaguars, and blue poison dart frogs are just a few of the magnificent animals found in rainforests.
b9am0 TIL that that the most expensive medicinal fungus in the world is found only in the Himalayas at an altitude of 3000 to 5000 meters. The yarsagumbas are known for their aphrodisiac property and for this reason they are popularly known as Himalayan Viagra. The cost per gram is about 100 $.
rRlpd TIL that two-time Medal of Honor recipient Major General Smedley Butler recommended in his 1935 book 'War is a Racket' that industries should be conscripted before soldiers to limit war profiteering after his experiences in the Banana Wars and WWI.
VBRlp TIL that all indigenous languages in Bolivia are official, hence Bolivia lists 36 languages as having official national status.