This is simply an idea, as I have no mechanical knowledge, but I'd like to consider ways to power my laptop, as (besides a refrigerator) I imagine it uses more energy than any other device I use.
I notice that I often tap my feet while sitting at my desk, and I wonder if there could be some sort of pedal device, like bicycle pedals, that would 1) give my legs something to do while I sit and 2) generate power for my laptop. It's sort of like the idea of using a treadmill or bicycle machine to power a TV for the user to watch while exercising.
Not only would it be a cheap, renewable way to power a gadget that's on for nearly as long as I'm awake each day, but it would also be encouragement to move about (and maybe burn some calories) while sitting on the computer.
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