It comes after the US president directed his administration to declassify more information on the issue ...

A polarizing Harvard astronomer known for splashy theories about alien visits has been tapped by the White House to lead a ...

The orbital surgery on the International Space Station returned the Canadian-built robot arm to full health after its "wrist" ...

In the earliest stages of life, mammalian embryos start as a disorganized cluster of cells. As development progresses, these cells become organized into well-defined shapes and structures. This ...

The origin of turtles has puzzled scientists. A new study provides more evidence that these shelled reptiles share a common ...

The permanent loss of amputated digits and limbs is the cost of being human. While worms, amphibians, fish and echinoderms ...

Echinoderms, such as starfish, sea urchins and sea lilies, use small, flexible, tubular projections called "tube feet" for ...