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The CDC combines results of a test that spots people who are actively infected with results from another one that looks for antibodies. Scientists say it could create a false picture of the pandemic.

CEO Mark Zuckerberg says he expects 50% of the social network's workforce to be working remotely within the next decade.

The Georgia Bureau of Investigation has arrested a third person in connection with the killing of Ahmaud Arbery. Authorities arrested William "Roddie" Bryan Jr., the man who filmed the altercation.

The 34-nation agreement allows the U.S., Russia and other countries to fly their aircraft over each other's territory. The Trump administration says it will negotiate a new deal with Russia.

Colleges might be able to reopen their campuses if they're able to frequently test their students. But can they get tests --- and with budgets already squeezed, will they be able to afford it?

Moss balls seem to roll around glaciers in a coordinated way, and researchers can't explain why the whole group moves at about the same speed and in the same direction.

In the 1950s, as Dr. Jonas Salk and virologist Albert Sabin worked to create a vaccine to prevent infantile paralysis, the threat from polio was already long familiar to Americans.

William "Roddie" Bryan has said he was a witness. "I can tell you that if we believed he was a witness we wouldn't have arrested him," the director of the Georgia Bureau of Investigation says.

In a letter sent to Secretary of Health and Human Services Alex Azar, these U.S. scientists said they were "gravely concerned" about the abrupt termination of a federal grant to EcoHealth Alliance.

Officials say the scammers took advantage of vulnerabilities in the system as the state rushed to get unemployment benefits to people quickly.