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 ...