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The consensus has been that Pfizer and Moderna are most protective. But a study looking at 5 vaccines — including Russia's Sputnik V and two Chinese types — offers an unexpected finding.

A stay-at-home order has meant a loss of income for many of the working poor — and the fear that they won't be able to feed their families. Then a group of organic farmers had an idea.

Even as social restrictions ease in some spots, older adults remain extra-vulnerable to COVID-19. That means many families are facing hard choices — whether to hunker down together or apart.

"We can do a lot better," said Laura Edelson, lead author of a new study on Facebook's ad program. "This is not the state of the art of content moderation, or detection of problematic content."

He and his team were stunned by the number of mutations. They felt they'd made a contribution by alerting the world to a dangerous variant. Then came the travel bans for residents of southern Africa.

After months of speculation over whether the vaccine-skeptical star would take part in the Australian Open, Djokovic seemed set to play — then border officials revoked his visa, leaving him in limbo.

Tickets may be easier and cheaper to get for the plays that are still open. Some producers reopened until the virus raced through the cast and crew. Future productions are hard to see on the horizon.

Just like in the U.S., airlines and airports that slashed jobs during the depths of the COVID-19 crisis are now struggling to keep up with exploding travel demand.

A new U.N. report shares data points about the world's child mortality rate. We interviewed a doctor in Nigeria — where rates of child death are among the world's highest — to offer his insights.

By Monday, at least 31 states will be open or partially open, often in opposition to guidelines from scientists. President Trump has been pushing for the country to get back to work.