From giant stick bugs to rarely seen sea creatures, these animal videos fascinated us—and led to new scientific discoveries.

Cosmonauts Oleg Artemyev and Sergey Prokopyev successfully installed the first ICARUS experiment antenna on the outside hull of the International Space Station during a nearly eight-hour space walk in ...

For the first time, Antarctic krill have been found on seafloor vents. One scientist is working to figure out what they are doing there. Kim Bernard, at left, is an expert on Antarctic krill, a ...