where the speed of light is constant, the speed of sound on the other hand is only constant within the medium it is in. it's a great, central neighborhood where you can easily walk, or take a car, to nearby shopping and restaurants. thanks for stopping by, and don't forget to read other articles we have. i especially loving it on kids right now. next christmas i will try to allow enough time to press them, but if not, i know they will still taste great and a tradition can carry on to the next generation. well i read the stories to set the mood. 