Masks are fitted to the player's face and can withstand multiple high-speed impacts from pucks.
The matter in the rings may once have been part of a moon (or moons) that was shattered by high-speed impacts.
For example, skateboard helmets are designed to absorb high-speed impact and cover more of the head than bicycle helmets.
In other cases, high-speed impact with a substrate at the bottom of the tower is an intentional part of the experimental protocol.
If the surface of Titan is icy, a high-speed cometary impact will temporarily melt the ice.
The data are also consistent with the dust being created by high-speed impacts of other particles.
And, initially at least, each tower did survive the high-speed impact of a larger jet, a Boeing 767.
Other experts favor a high-speed ballistic impact or using the gravitational attraction of a hovering spacecraft to nudge the asteroid off course.
Auto executives said that the car occupants could have been killed in the high-speed impact even if hit by a car instead of a Bronco.
Many in the ski industry say that helmets will not eliminate serious injuries, especially in high-speed impacts.