Having witnessed how a couple of young boys bang their heads full force into a one-inch thick steel bomb-shelter door to "make it sing" I have to disagree somewhat with this scientist.
If you know how to use it properly, the age old head-butt is a formidable self-defense weapon! It is also quite easy to defend against - if you see it coming...
You just need to bend you head and turn it sideways ever so slightly. The effect is that the attacker hits you where your skull is most solid (think of the point where horns would be placed). This point is the same used for a "proper" head-butt.
The technique called "Scottish kiss" or "Liverpool kiss" is brutal and highly effective.
Story:
It's a guy thing.
The head-butt reared its ugly head at the weekend when France's Zinedine Zidane head-butted the chest of Italian defender Marco Materazzi during the World Cup final.
"Most animals that fight that way have skulls built to take it. We don't appear to be built that way," says Katherine Ralls, senior scientist at the Smithsonian's National Zoo in Washington. "But I guess when you get so much adrenaline and testosterone going, it's butt first and think later."
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