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And if you can break the speed of light, you don't need a second exchange.

It’s quite easy to “break” the speed of light in fiberoptic glass.

But it's not that useful even if you pour a glass cube over the whole exchange to slow it down.

> It’s quite easy to “break” the speed of light in fiberoptic glass.

I don’t understand this, why? Does light travel faster than the speed of light in fibre optic glass?

"the speed of light in fiberoptic glass" is the thing being broken.