By Cat DiStasio
A lot of hard work goes into engineering the gadgets that surround us, but technology isn't all work and no play. In fact, there's a number of really smart, practical products out there that harvest energy from the power of movement. Many of these products are no- or low-electricity devices designed to make life in developing countries easier and, perhaps, a bit more fun. A soccer match can help light an evening homework session. A tedious chore like washing clothes becomes a great opportunity for a little exercise. And getting access to clean drinking water can quite literally be child's play.