Scientists found evidence of two interleaved systems, which may help explain the connection between what's going on in our bodies and what's going on in brain areas involved in thoughts and emotions.
The rate of U.S. gun homicides jumped nearly 35% in 2020 to the highest level in more than 25 years. And gaps widened for groups already at the highest risk, especially Black men and boys.
Scientists now know that the potency of the booster shot wanes quickly after about three months. We look at the latest research on a fourth shot.
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By:
Michaeleen Doucleff
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