Harnessing the power of the sun is hardly new. Calculators and wristwatches have been powered by solar for decades. Only recently, however, has solar graduated to bigger applications, such as airplanes and—even more ingenious—trash bins that track real-time trash levels to help optimize pickups. The new solar movement is also helping to power entrepreneurs and designers who want to create fun little add-ons to things like sunglasses or swimming goggles.
