An analysis of the sloth family tree suggests three different groups of the animals evolved to gigantic sizes in response to ...

Our satellite is a little off-balance. GRAIL data show a mass asymmetry of a few percent between its near and far sides.

A new study finds that an easily measurable brain wave shift of phase may be a universal marker of unconsciousness under general anesthesia.

In the natural world -- where predators pounce, prey flee, and group members feed and sleep in solidarity -- animal behavior is glorious in its variety. Now, new research suggests there may be an ...