People who develop Covid-19 infect around half of their household members, with adults only slightly more likely than children to spread the virus, a US government study said Friday. The paper by the Centers of Disease Control and Prevention (CDC) is the latest to attempt to quantify the...

NASA's robotic spacecraft Osiris-Rex is set to begin on Tuesday a delicate operation to store the precious particles it scooped up from the asteroid Bennu, but which were leaking into space when a flap got wedged open. The probe is on a mission to collect fragments that scientists hope will...

His press secretary once described President Donald Trump as the “most tested man in America” when it came to COVID-19. And variations on that message were the White House ready response any time critics questioned the president's lax approach to following guidelines for avoiding the novel...

A major non-profit health emergencies group has set up a global laboratory network to assess data from potential COVID-19 vaccines, allowing scientists and drugmakers to compare them and speed up selection of the most effective shots. Speaking to Reuters ahead of announcing the labs...