Twin satellites investigate the lunar surface and structure.
In the worldwide wildlife trade, public health risks run high.
Scientists observe dolphins and whales at play in Hawaiian waters.
Curiosity rover launched on November 26, beginning its long journey to Mars.
Conservation efforts lead scarlet macaws toward a comeback in Guatemala.
As the seasons come and go, plant life and carbon change on Earth.
Ancient fossils suggest modern humans populated Europe earlier than once thought.
Newly discovered dwarf galaxies are fast and furious in their production of stars.
Worldwide, a diversity of life dwells deep in the dirt.
Online game players manipulate models to solve a virus protein puzzle.