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It's a technique widely used in other countries to slow the spread of infection. Here's how contact tracing works — and how it can help the U.S. start to get back to normal.

"Harmful health advice and snake-oil solutions are proliferating," U.N. Secretary-General António Guterres said. "Wild conspiracy theories are infecting the Internet. Hatred is going viral."

The group includes several lawmakers who backed challenges to the electoral votes, as well as those who voted last week to impeach President Trump.

Poetry helps us express feelings that don't fit neatly into sentences; confusion and fear but also hope and joy. Here's the second installment of our look ahead at the most exciting poetry of 2021.

The two companies making COVID-19 vaccines each promised to deliver 100 million doses to the federal government by the end of March. So far, they appear to be running behind.

An image that seems to threaten former President Donald Trump has prompted Twitter to deactivate an account linked to Ayatollah Ali Khamenei. The image also appears on Khameini's website.

With the virus still raging in the U.S., public health experts say we can't afford to just wait around for the vaccine. They share advice for what communities can do now to slow the death toll.

President Biden pledged to reopen most of the nation's K-12 schools during his first 100 days. When asked if that goal was "too optimistic," Cardona said, "No, I think it's strong leadership."

"This is a national emergency. Four hundred thousand people have died. Everything is on the table across the whole supply chain," said Jeffrey Zients, the White House COVID-19 response coordinator.

Former Michigan Gov. Jennifer Granholm says "good-paying jobs" can help zero out U.S. greenhouse gas emissions by 2050. But some Republicans are skeptical they can help fossil fuel workers.