After a May 6 liftoff was scrubbed, the astronauts returned to their home base in Houston and continued their preparations for Saturday’s flight.

Butch Wilmore and Suni Williams are waiting to lift off on the launchpad at Cape Canaveral as flight controllers resolved an issue with a sensor on their rocket.

The agency’s staff analysis suggests that approval of the illegal drug known as Ecstasy for treatment of PTSD is far from certain, with advisers meeting next week to consider the proposed therapy.

A fern from a Pacific island carries 50 times as much DNA as humans do.

New research shows that people who develop dementia often begin falling behind on bills years earlier.

On the Norwegian island of Leka, archaeologists have unearthed the earliest known ship burial in Scandinavia.