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People who have had a stroke appear to regain more hand and arm function if intensive rehabilitation starts two to three months after the injury to their brain.

A study of 72 stroke patients suggests this is a "critical period," when the brain has the greatest capacity to rewire, a team reports this week in the journal PNAS.

The finding challenges the current practice of beginning rehabilitation as soon as possible after a stroke.

Power outages are a growing problem in a hotter climate, and it's not just from bigger storms. Rising temperatures are also damaging trees, making them more likely to fall on power lines.

COVID-19 has now killed about as many Americans as the 1918-19 Spanish flu pandemic did — approximately 675,000.

The U.S. population a century ago was just one-third of what it is today, meaning the flu cut a much bigger, more lethal swath through the country. But the COVID-19 crisis is by any measure a colossal tragedy in its own right, especially given the incredible advances in scientific knowledge since then and the failure to take maximum advantage of the vaccines available this time.

Copyright 2021 NPR. To see more, visit https://www.npr.org.

Copyright 2021 NPR. To see more, visit https://www.npr.org.

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