[sheltonmac]

It is easy to demonstrate that the speed of light is not constant. Just take a stopwatch and measure the length of time it takes for the bathroom light to come on after you flip the switch. You will come up with a different reading each time.

Seriously, this is interesting stuff. It will be especially interesting to see how this affects our understanding of measuring size and distance in the universe.

[OBAFGKM]

It is easy to demonstrate that the speed of light is not constant. Just take a stopwatch and measure the length of time it takes for the bathroom light to come on after you flip the switch. You will come up with a different reading each time.

I tried it and I was about to correct you, but then I realized the batteries in my watch were dead.