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TIL there's an Underground river beneath the Amazon River, it was discovered in 2011 and its about as long as the Amazon river, but it is much broader. It's unofficial name is the Rio Hamza

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via reddit.com

Ok1R TIL a National Geographic photographer (Arctic specialist) felt “true love” for, and nurtured by, a 1000 lb. leopard seal that could “kill you in an instant” He spent 4 days in the water with her while she continually tried to feed him penguins. (On the link story starts around 51 minutes in)
4XYDa TIL a Japanese man has been sending identical handwritten letters weekly to a hotel in the Netherlands for the last 40 years.
pl1O TIL that bioluminescence is one of the most common and least understood forms of communication on Earth.
QB9e TIL that .tv domain originates from the island country Tuvalu, the domain generates 2.2 million dollars which accounts for most of the goverments revenue
d8no8 TIL the national Do Not Call (DNC) Registry does not include calls being made for the sole purpose of conducting a survey or poll, those calls are exempt.