Explained: Selecting the Covid-19 booster vaccine.

Covid-19 booster dose: ‘Precautionary’ doses for vulnerable groups have begun, using the same vaccine the beneficiaries were previously given. What is the rationale behind this, and the arguments for and against mixing vaccines? Written …

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Stress may be your heart’s worst enemy.

Chronic psychological stress, recent studies indicate, may be as important — and possibly more important — to the health of your heart than the traditional cardiac risk factors. By: New York Times | New York | …

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