Rivers join downstream, flow downhill, and eventually meet an ocean or terminal lake: These are fundamental rules of how ...

Iranduba, Brazil: Floating in the Rio Negro river in the Brazilian Amazon, Luiz Felipe, who has Down Syndrome, beams as he hugs a pink dolphin during a special therapy session. Luiz Felipe, 27, is ...

For a period of two years, between 1850 and 1852, the English naturalist Alfred Russell Wallace traveled up and down the Negro river, one of the main tributaries of the Amazon river. It was one of the ...