[Paul Junkin] bought a curious product off the Internet. It was supposed to generate electricity when hooked up to a running hose. Only, it didn’t do a very good job. His solution was ...

Equipment that can generate electricity by pedaling a bicycle is generally sold widely, but it is possible to produce a generator with your own hands as long as you have the tools. Marie Verdeil and ...

Dear Tom and Ray: Say I have an electric car (one that runs on nothing but electricity) that can be charged by plugging into any outlet. But for cross-country trips or long trips outside my car’s ...