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Why are sea lion pups crowding California’s shores?

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PBS News Hour

Can a helmet sensor help prevent brain trauma in athletes?

As we learn more about the effects of concussions and sports-related head trauma, parents, coaches and medical professionals are debating how to keep players safe. Some are looking to technology, like a device worn under the helmet that shows the force of impact after a fall or collision. Hari Sreenivasan reports as part of our Breakthroughs series.
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