How to slow down light until it stops
In vacuum, light always travels at a constant speed of 299,792,458 metres per second. Nothing can travel faster than this constant c, as denoted by physicists. These two postulates are basic building blocks of modern physics and were first announced more than a hundred years ago by Albert Einstein. Yet, there are ingenious ways to slow light to the point of trapping it in a dead stop. Prepare for some weirdness.
