Most fish need oxygen-rich water to survive. But there are a few remarkable species that have figured out how to live when that oxygen runs low– or disappears altogether. From ponds that go still and ...

Nighttime drops in ocean oxygen raise energy use in small reef fish. Repeated stress could affect reef health as oceans warm.

Humans are not yet done cooking. We're continuing to evolve and adjust to the world around us, the records of our adaptations written in our bodies. We know that some environments can make us unwell.