A. This is what they're doing at the Arizona Diamondbacks' stadium. By pedaling you can see how your energy can be converted into electrical energy -- with the right apparatus! People compete to see how fast they can get the lights to light up. URL is fastest, takes the least energy; incandescent (traditional lightbulbs) is slowest, takes the most energy.
B. www.pedalpowergenerator.com is a very good site with videos that show you how to convert your bicycle into a power generator. MNS Power is the company.
C. It's being done in places in Africa where they don't have electricity. Similarly, I just found on Facebook that there is a soccer ball called "Socckett." All the kinetic energy that's generated while playing soccer gets stored inside the ball. Afterward you plug in an appliance and -- voila! Light! Or music! Or whatever you want.
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