A Dartmouth football player watches from the sideline during a practice in Hanover, N.H, on April 28, 2017. This particular helmet has sensors in it.(Valley News - Jennifer Hauck) Copyright Valley News. May not be reprinted or used online without permission. Send requests to permission@vnews.com.

A Dartmouth football player watches from the sideline during a practice in Hanover, N.H, on April 28, 2017. This particular helmet has sensors in it.(Valley News – Jennifer Hauck) Copyright Valley News. May not be reprinted or used online without permission. Send requests to permission@vnews.com.

A Dartmouth football player watches from the sideline during a practice in Hanover, N.H, on April 28, 2017. This particular helmet has sensors in it.(Valley News – Jennifer Hauck) Copyright Valley News. May not be reprinted or used online without permission. Send requests to permission@vnews.com.

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