It takes 120 J of energy to light two 60-watt light bulbs for 1 second, right? And the average phone takes 18000 Joules of energy to completely charge so that's only 150 steps!
... I'm sure there is something wrong with that line of thought, haha
I was inspired by this article
to wonder if one could put piezoelectric crystals in the sole of a shoe and perhaps harness the energy to charge their iPod?
Can someone let me know if this is feasible...