It's fun skipping rocks across a pond, but researchers are going a step farther to study the physics involved.
Airplanes are loud. Very loud. And all that means is that they're pumping out massive amounts of acoustic energy that's being wasted assaulting your eardrums. Airport runways made of custom "designer" gravel could harvest some of this energy and turn it into useful amounts of electricity.
I have no idea why all these big name companies are suddenly deciding that the future of storage lies in optical media. First it was Panasonic's 100 gig Blu-rays, then GE's holographic discs, and now LG has announced a new long-term optical storage medium made out of rocks.