The Amazon rainforest is fed by a rich network of creeks, streams and rivers. Informal road construction is now endangering this critical ecosystem. Rickey Rogers/Reuters

Amazonian dirt roads are choking Brazil’s tropical streams

Thousands of dirt roads crisscross the Brazilian Amazon, serving ranchers, loggers and miners. The area's fragile waterways — and the spectacular fish that live in them — pay a high price.
A large female Greenland shark observed near the community of Arctic Bay, Nunavut. (Brynn Devine)

Caught on camera: Ancient Greenland sharks

Using baited cameras scientists have captured some of the first underwater video footage of the elusive Greenland shark.

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