Researchers also found that balls inflated at higher pressure hit the head with greater acceleration, even when kicked at the same speed.

WSJ: Soccer 'Header' Impact Likened to Hard Punch

About ten minutes later, he has a 98-g acceleration to the front of his head.

NEWYORKER: Offensive Play

The commission's head honcho recently announced new actions to the Broadband Acceleration Initiative, clarifying technical provisions within the Middle Class Tax Relief and Job Creation Act of 2012 that should make mobile broadband deployment a little easier.

ENGADGET

Experiments measured the forces and acceleration of a regulation, adult-size-5 ball propelled repeatedly at a magnesium dummy-like head at 18 meters per second, which is considered the average speed a ball is kicked by nonprofessional players.

WSJ: Soccer 'Header' Impact Likened to Hard Punch