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People waiting for Air France flight to Paris at OR Tambo's airport in Johannesburg, South Africa.

Keeping an eye on Omicron

Epidemiologist who modeled variants awaits clearer picture, but says travel restrictions are unlikely to help

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Vials of booster vaccine

Breaking down boosters

What happens to our immune systems when we get a booster and will COVID boosters stay on the list?

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Daniel Lieberman, (blue shirt) and Aaron Baggish.

Taking it easy as you get older? Wrong.

Message of new Lieberman study: ‘Because we evolved to be active throughout our lives, our bodies need physical activity to age well’

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Mark Namchuk.

Pills could prove COVID game changer

Med School specialists say they may cut hospitalizations, deaths and offer big boost to nations struggling with low vaccination rates

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Illustration of person looking at light at end of abstract tunnel.

How death shapes life

As global COVID toll hits 5 million, Harvard philosopher ponders the intimate, universal experience of knowing the end will come but not knowing when

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