A medical mystery solved: Scientists have found the first genes linked to stuttering. Previously, stuttering has been blamed on things like nervousness or stress. The gene discovery may lead to a future enzyme treatment for stutterers:

"In terms of myth busters, this is really an important step forward," said Jane Fraser, president of the Stuttering Foundation.

Researchers taking part in a government-funded study discovered mutations in three genes that appear to cause the speech problem in some people. Stuttering tends to run in families, and previous research suggested a genetic connection. But until now, researchers had not been able to pinpoint any culprit genes.

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Researchers have found that making teens go to bed before midnight can make them less impulsive. Impulsiveness has been linked to bad behavior like juvenile delinquency, truancy and poor exam results:

The researchers, from the Kyushu University Graduate School of Medicine in Japan, recommend that pupils get involved part in after-school activities or to take regular exercise, to help them get an early night.

The study was based on questionnaires given to 1,934 secondary school pupils in Japan, which asked them when they regularly went to bed and gave them a test designed to score how impulsive they were.

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Good news for chocolate lovers: New analysis of previous studies suggests eating a bar of chocolate a week may help lower risk of stroke and risk of death after a stroke. Another reason to buy your sweetheart a treat for Valentine's Day:

Sarah Sahib, BScCA, of McMaster University in Hamilton, Ontario, and colleagues reviewed three studies, two of which showed that chocolate significantly reduced stroke risk, likely because of its flavonoid content.

The third found no association between chocolate and risk of stroke or death, according to their study slated to be presented at the American Academy of Neurology meeting.

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