AUTOBLOG has a report on a clever new helmet for bikers that uses corrugated cardboard as the shock-absorbing medium. If you need a brain-bucket, check it out before you wish you had.
The technology is called Kranium, and it uses interlocking ribs made from cardboard housed under a stiff plastic shell. Since the cardboard is easily manufactured and cut to shape, custom fitment is possible by means of a simple and personalized head-shaped template. This way, the guts can be cut out of a single cardboard sheet and replaced without buying a completely new helmet.
Tests show that these cardboard helmets can withstand four times more impact energy than regular helmets.