Author: CNN Wires

Senate impeachment trial of Donald Trump officially begins

The third Senate impeachment trial of a US president in history convened on Thursday with the reading of the impeachment articles against President Donald Trump and the swearing in of Supreme Court Chief Justice John Roberts and the senators who will decide whether Trump should be removed from office.

Treating the first known blood clot in space

When astronauts encounter a medical risk on the International Space Station 250 miles up from the Earth's surface, it's not exactly easy for a doctor to make a house call. So when NASA researchers suspected a blood clot in one of their astronauts during a long-duration stay on the space station last year, they had to act quickly to treat the unexpected risk.