Think you know the speed of light?

Guess again... the speed of light has been known as 186,000 miles per second. Well all that has just changed.

A team of researchers from the Ecole Polytechnique Fédérale de Lausanne (EPFL) has successfully demonstrated, for the first time, that it is possible to control the speed of light – both slowing it down and speeding it up – in an optical fiber, using off-the-shelf instrumentation in normal environmental conditions.