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Scientists rapidly identified the Omicron variant. But firm answers about its impact could take weeks
Countries shouldn’t invoke the Nagoya Protocol to avoid sharing pathogens and genetic sequences
What’s known and unknown about Omicron, the coronavirus variant identified in South Africa
New data, analyses take some of the shine off Merck’s Covid pill
New research casts fresh doubt on a common procedure that promises to increase the odds of IVF
The pandemic has deeply affected many people with eating disorders
