New gel will stop speeding bullets -- and linebackers

The London Telegraph reports the British military has signed a contract with a company to provide a new gel which is supposed to be flexible until it is hit with force and then it will stop bullets.

The gel, called d3O locks instantly into a solidified form when it is hit at high impact.

"When moved slowly, the molecules will slip past each other, but in a high-energy impact they will snag and lock together, becoming solid," said Richard Palmer, who invented the gel. "In doing so they absorb energy."

It's already being used in sports equipment, as is shown in this video which is Japanese (??). I don't speak Japanese, but the pictures speak pretty loudly all by themselves.