Most researchers says that there are "open lines of communication" between the brain and the bowels, and that in mice, this line allows an individual's gut bacteria to influence behavior, says Not Exactly Rocket Science's Ed Yong. A new study published in PNAS solidifies the evidence for the "gut-brain axis," he adds.

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Under a proposed spending bill, the US National Institutes of Health would see an additional $3 billion in funding.

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