Could the movement of your breasts within your sports bra create enough energy to power a small device, like an iPod? The short answer is yes, it certainly could. But there's more to it than just bouncing them around enough to create energy -- that energy then has to be harnessed.

Slate recently had an article on what would need to occur in order to harness the power of our swaying breasts (I mean actual energy power -- not the power to stop men in their tracks or knock over a small child), and believe it or not, there's some serious technology already at work regarding this. However, each possibility has its problems.

For example, one researcher has fabric made of nanowires that could easily be used to create a bra. However, it couldn't be washed -- ew! And then, there's the Lightning Pack technology that's already at work in backpacks for serious hikers and the military, and while this technology could be used on the bra strap, there's a generator and a piston involved, and, long story short, it just wouldn't be too comfy.
So, as of right now, the motion of your breasts in your sports bra isn't going to make your iPod run. Bummer, I know. But it's pretty cool to know the technology just needs a bit of tweaking. In fact, within five years we can probably expect to see at least t-shirts made of nanowires, and who knows what else?