As Fast As The Speed Of Light,

normally the speed of light is always almost 300,000 kilometers per second, but it can be slowed down to 6.12 kilometers per hour, how? with the bit of kit above, old news I know but well, I like to put interesting (to me) stuff on the blog, the above was used in an an experimental demonstration of electromagnetically induced transparency in an ultra cold gas of sodium atoms, in which the optical pulses propagate at twenty million times slower than the speed of light in a vacuum, the gas is cooled to nanokelvin temperatures by laser and evaporative cooling, so as a kid I can remember The Lone Ranger introduction song about he and his horse Silver travelling at the speed of light, well perhaps it was only about 6 kilometers per hour.