How to control light with water

And the coolest part about optical fiber is that we make cables so well that we are still an order of magnitude away from maxing out the physical capabilities of our current fiber, so without having to redo the cabling, we can still make the internet a factor of 10 faster. After that we'll need to use a diamond/glass composite for diamond's wider bandwidth and a more acute critical angle, allowing for more physical space in multimode operation. Might be able to squeeze another order of magnitude out of that before we work out how to make fiber optics with a vacuum as a core...