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With the FDA poised to OK another booster for people 50 and older, questions remain: Is the evidence strong enough to warrant a fourth shot, does the timing make sense, and will there be much demand?

The Food and Drug Administration has authorize fourth shots for those age 50 and older. The move is aimed at shoring up waning immunity, especially as the U.S. faces the possibility of another surge.

Maintaining a fire tower lookout can be costly for wildfire agencies, but in the West, many towers are still staffed by seasonal employees. Now the Oregon Department of Forestry is phasing out human lookouts in exchange for highly sensitive cameras. These cameras have the potential to change the way fire departments detect fire nationwide.

NPR's Audie Cornish talks with Senate Intelligence Committee member Ron Wyden, D-Ore., about election security going forward in the 2020 elections, given the issues with Iowa's caucuses.

The omicron variant is so contagious that researchers who study transmission say consumers should consider wearing N95s and taking a rapid COVID test shortly before gathering with friends and family.

In small studies in South Africa and in Germany, the results indicate a marked decrease in the ability of vaccines to neutralize this variant. But there are other findings that are encouraging.

"This wave seems much faster than the delta wave. And we thought the delta wave was really fast. It's unbelievable," says Juliet Pulliam, the scientist who presented the new analysis at a conference.

Following protests, China announced a series of measures to roll back some of its most controversial COVID restrictions. They include allowing those with mild or no symptoms to quarantine at home.

Authorities in Madison, Wisc., don't yet know what led a student to open fire at Abundant Life Christian School killing a teacher, a fellow student and injuring six others.

The new top two leaders at the FBI are Trump loyalists with no prior experience at the bureau. NPR asks retired FBI special agent Thomas J. Baker for his impressions of Kash Patel and Dan Bongino.