Afraid of roller coasters? You’re more likely to get brain damage from a pillow fight:

Another paper compared head motions that occurred in 4 participants when they rode 3 different roller coasters at Six Flags, drove bumper cars, and had a pillow fight (Pfister et al., 2009). What are the implications for brain injury? they asked.

The 18 mph (8.1 m/s) car crash simulation resulted in the highest measurements of linear acceleration, linear velocity, and rotational velocity of the head. The highest level of rotational acceleration was measured during the pillow fight. Interestingly, the pillow fight generated peak head accelerations and velocities greater than the 3 roller coaster rides.

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