Decreased protection from cosmic radiation may have increased oxygen levels in the atmosphere and oceans, allowing animals to grow larger.

The new low-tech transportation method could help scientists in Africa assess if malaria-carrying mosquitoes are resistant to a common insecticide.

Mars Sample Return and missions to study other planets and celestial bodies, including lunar efforts, face big cuts and delays.

On June 4, 2021, amid flowering saguaros and prickly pear cacti, a wildfire bloomed in the Sonoran Desert in central Arizona. Its nascent flames gorged on nonnative grasses desiccated by a long ...

A volcanic eruption at Yellowstone is unlikely anytime soon, but evidence is growing that a violent hydrothermal, or steam, explosion is possible.

When dice snakes fake their death to avoid predators, those that use a combination of blood, poop and musk spend less time pretending to be dead.

The discovery of sympathetic nervous system cells in lampreys draws a closer tie between the animal and complex vertebrates — such as humans.

Researchers have created a visual encyclopedia of the different expressions that belugas ( Delphinapterus leucas) in captivity seem to make with their highly mobile “melon,” a squishy deposit of fat ...

Experiments in mini greenhouses show how the tiny organisms lurking underground in a "sleepy biome" could be a contributor to climate change.

Over time, bone marrow stem cells develop key genetic errors and pass them on to immune cells. This may increase the risk of developing heart disease.