mindsparksss on Instagram: "The entire modern internet exists because light can be controlled inside glass.🔬⚡ Fiber-optic cables are built from ultra-pure glass engineered to trap light inside. When light enters the cable, it reflects continuously along the inner walls rather than escaping. That controlled reflection allows the light to travel long distances while carrying encoded data as rapid on-off pulses. Those pulses represent information, everything from messages to videos to cloud traffi