Rob Stein

For decades, scientists have been prohibited from keeping human embryos alive in their labs for more than 14 days. The prohibition was aimed at avoiding a thicket of ethical issues that would be raised by doing experiments on living human embryos as they continue to develop.

Routine screening for colorectal cancer should begin at age 45 instead of 50, an influential panel is recommending.

Starting routine screening five years earlier could prevent more deaths from colorectal cancer, which is the third-leading cause of cancer deaths in the United States, the U.S. Preventive Services Task Force concluded.

Carlene Knight would love to do things that most people take for granted, such as read books, drive a car, ride a bike, gaze at animals in a zoo and watch movies. She also longs to see expressions on people's faces.

"To be able to see my granddaughter especially — my granddaughter's face," said Knight, 54, who lives outside Portland, Ore. "It would be huge."

Nearly 100 million Americans are fully vaccinated and new coronavirus cases are at their lowest level since last October. Could the vaccination campaign finally be winning the race against the coronavirus in the United States?

The Biden administration will send $1.7 billion to the Centers for Disease Control and Prevention and local and state governments and other research efforts, starting early next month to find and track coronavirus variants lurking in the United States. Already, the more contagious U.K. variant, B.1.1.7, is now the dominant strain in this country, fueling surges in Michigan and the Northeast.

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