These phones were made for walking

One item that caught my eye over the summer was this reference to the use of movement, when somebody is walking, to generate electricity for their phone.  It’s not fundamentally a new idea; in fact the principle is similar to that of the self-winding watch, which first entered production nearly 90 years ago although it has largely been superseded by electronic mechanisms.  Still, anything which helps extend the time that modern mobile phones can keep going on one charge would be useful


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