World

The makers of COVID-19 vaccines are figuring out how to tweak their recipes against worrisome virus mutations — and regulators are looking to flu as a blueprint if and when the shots need an update.

The coronavirus most likely first appeared in humans after jumping from an animal, a team of international and Chinese scientists looking for the origins of COVID-19 said Tuesday, saying an alternate theory that the virus leaked from a Chinese lab was unlikely.

Facing a slower-than-hoped coronavirus vaccine rollout, the Trump administration abruptly shifted gears Tuesday to speed the delivery of shots to more people. The move came as cases and deaths surged to alarming new highs. Health and Human Services Secretary Alex Azar announced a series of major changes to increase supply of vaccines, extend eligibility to more seniors and provide more locations for people to get shots.

Amid worry about renewed violence on Inauguration Day, the military's top leaders issued a written reminder to all service members Tuesday that the deadly insurrection at the Capitol last week was an anti-democratic, criminal act, and that the right to free speech gives no one the right to commit violence.

A Chinese spacecraft landed on the moon to bring back lunar rocks to Earth for the first time since the 1970s, the government announced.