An experiment involving a sealed box that unexpectedly bursts open. The video shows pressure buildup, timing, and the moment the box fails, breaking down what causes a sudden explosion.

MANTUA, Box Elder County — A man was critically injured in a trailer explosion early Monday in Mantua, in Box Elder County.

SHE JOINS US NOW LIVE TODAY. DAVID, JEN, AS YOU JUST MENTIONED, THE HARVARD UNIVERSITY POLICE DEPARTMENT JUST RELEASED AN UPDATE SAYING THERE IS NO STRUCTURAL DAMAGE TO THE BUILDING AND THAT IT WILL ...