Liquid Crystals Slow Light Pulses to a Snail's Pace

In a vacuum, the speed of a light pulse is always a constant at 186,000 miles (300,000 km) per second. But by changing the medium through which light travels, physicists can slow down light pulses, and possibly create highly sensitive light interferometers, among other devices.

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<p><a href="http://www.physorg.com/news132303457.html">Liquid Crystals Slow Light Pulses to a Snail's Pace</a></p> <p>In a vacuum, the speed of a light pulse is always a constant at 186,000 miles (300,000 km) per second. But by changing the medium through which light travels, physicists can slow down light pulses, and possibly create highly sensitive light interferometers, among other devices.</p>