Fight or flight: The sympathetic nervous system

SpaceX launch: Crew 3 docks with ISS | The four SpaceX crew members arrived at the International Space Station after a journey of about 21 hours, to begin a six-month research trip. Flight commander Raja Chari said the ISS was "a pretty glorious sight."

Mind-blowing pictures of the solar system's most volcanic worlds

Immune system early responder can combat COVID-19