Light moves at the same speed in air as it does in a vacuum(Just under 300'000'000 km/s). However is does slow down in fibre optic cables(just under 200'000'000 km/s)
There was an article on what you are talking about a few months ago. As I recall it would use the vibrations from your footfalls and the underground to creat electricity to power the lamposts.
And we all care about the state of glass because.................
Let the hive mind of Engadget get that for you.
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