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His team raced a pair of photons. One traveled unchanged through a cable made from optical fibers. The other passed through a pair of devices that acted like lenses. A lens changes Ceiling Lights: It can focus a spread-out beam of light into a point, for instance. The second photon passed through one device that changed the shape of its wave and another that changed it back to its original form.

The first photon won the race. The second photon came in a tiny bit later, several quadrillionths of a second late for every meter of the race. The difference wasn't huge, but it was enough to measure. Most technology would not pick up such a small change, but it could be important to scientists who study short pulses of light.Light doesn’t always travel at the speed of light. A new experiment reveals that focusing or manipulating the structure of light pulses reduces their speed, even in vacuum conditions.