I would like to hear others opinion on this.

I read this article:

http://www.sciencedaily.com/releases...0720210700.htm

It claims that: A concussion occurs at roughly 90 to 100 g-force, "which is like smashing your head against a wall at 20 mph," Broglio said...

Well i got my concussion by standing up in a cabinet a lot slower than 20 mph. Am i extremely fragile or is the article wrong?

Sounds to me like 20 mph into a wall head first would be fatal or close to it.