Extend Your iPhone 4's Battery, Researching a Cure for Alzheimer's, Change Out Your Camcorder Lenses, Cute Turtle Robots

The first wrap-around battery pack for the iPhone 4 hits the market, researchers are closing in on a cure for Alzheimer's, Sony has the world's first HD camcorder with interchangeable lenses, and a cute turtle robot to steal your geeky heart.