World

Cases of the omicron variant of the coronavirus popped up in countries on opposite sides of the world Sunday and many governments rushed to close their borders even as scientists cautioned that it's not clear if the new variant is more alarming than other versions of the virus.

Scientists temporarily attached a pig’s kidney to a human body and watched it begin to work, a small step in the decades-long quest to one day use animal organs for life-saving transplants.

Love cryptocurrencies or hate the very idea of them, they’re becoming more mainstream by the day. Cryptocurrencies have surged so much that their total value has reached nearly $2.5 trillion, rivaling the world's most valuable company, Apple, and have amassed more than 200 million users. At that size, it’s simply too big for the financial establishment to ignore.

Scaling down his “build back better” plans, President Joe Biden has described a more limited vision to Democratic lawmakers of a $2 trillion government-overhaul package with at least $500 billion to tackle climate change and money for middle-class priorities — child tax credits, paid family leave, health care and free pre-kindergarten.

At a school in San Francisco, Governor Newsom announced plans to add the COVID-19 vaccine to the list of vaccinations required to attend school in-person when the vaccine receives full approval from the Food and Drug Administration (FDA) for middle and high school grades, making California the first state in the nation to announce such a measure. Following the other first-in-the-nation school masking and staff vaccination measures, Governor Newsom announced the COVID-19 vaccine will be required for in-person school attendance—just like vaccines for measles, mumps, rubella and more.