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Body & Brain

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Repeated helmet impacts have been linked to changes in the white matter of some football players' brains. The changes lingered even after six months of no-contact rest, which suggests that repeated hits over many seasons may lead to cumulative alterations, scientists say.

Genetic changes associated with Down's syndrome may happen on all chromosomes, not just chromosome 21, a study suggests.

UNNECESSARY SUFFERING  Despite the availability of a potent vaccine, measles continues to cause outbreaks around the world due to its high transmissibility, spotty vaccine coverage in some poor countries and vaccine avoidance in wealthy ones. The infection has no effective treatment, so researchers are working to develop antivirals.

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