UC-Davis researchers developed a lens that'll turn your iPhone or any camera-enabled smartphone into a 350X microscope. The mod is a simple 1-mm ball lens mounted in rubber that's taped to your phone's camera. It costs no more than £25.
Solar-powered chargers make me feel like I'm doing something nice for the Earth. Too bad I never use the damn things because positioning them for optimal Sun-catching is a pain in the ass. The Ray solar charger's suction cup action solves that problem.