Mystery #3Tier 3fibre optics
How can the whole internet zoom down a hair-thin thread of glass as flashes of light?
Every video you watch and message you send can travel through a thread of glass thinner than one of your hairs, packed into cables that cross whole oceans. Inside there is no electricity racing along, just light, flashing unbelievably fast. How can the whole internet zoom down a hair-thin thread of glass as flashes of light?
Your guess
How do you think the light is kept inside a long, bendy glass thread without leaking out?
There's no single magic word to type, have a go in your own words, then reveal the answer to see how close you got.
Make a guess to unlock the hints and the answer.