A couple of weeks ago I saw on the TV a very interesting video about a pretty sustainable invention. It's nothing different than a paving slab but the tricky bit is that when you walk on it the kinetic energy of the feet create energy. It's made of stainless steel and recycled tyre and recycled aluminium. The paving sinks down with 5 mm and that generates enough energy to light the embedded bulb. And that's after only 5% of that 1step have been used. The other 95% are stored in a battery and used to illuminate nearby signs or bus stops.
As I kept on researching I actually realised that this invention is not new. Since 2009 it has been even in use in London.
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