We got some cool weather today along with some scattered showers. My wife was sitting there in deep concentration so I asked her what she was thinking. She said she was counting the seconds between the lighting flash and the thunder. She said that the light gets here much faster than the sound and you can estimate the distance to the storm by measuring the difference. I said that it wouldn't work since A. Einstein proved that nothing can travel faster than the speed of sound in a vacuum, and how stupid she was to say such a thing. I'm not half as stupid as you are she remarked. Oh yes you are said I. She had no comeback for that zinger and so she just sat there with a sheepish grin on her face.