CNN Around the World July 9, 2013 16:55:00
Hard surface like concrete more like internal bleeding. it's always dangerous if you hit your head here on the floor it's carpet, it absorbs. concrete doesn't yield. when your head hits concrete your head heels, not the concrete. it's dangerous. could you kill somebody, sure, if you banged them hard enough. even if you don't do enough to injury the brain substantiateig you're going to have some stunning effect. that's what concussion, these football players who get the concussion, what it is it's
Source: archive.org