[de Silentio]

What do you mean by beam?

From what I understand, light demonstrates properties of both waves and particles. I don't think we really understand all that light is. There is a lot of websites out there about light.

What interests me most is the relation between time, light, and space, as exemplified by Einsteins theories of relativity. Why is it that mass and speed determine the flow of time? Then, why is it that we always experience time flowing the same, even though it is flowing different for me than it is for you?

If my last sentence didn't make sense, try this on for size. If I travel 80% the speed of light away from Earth for 6 months (my time inside the space ship), then travel back to Earth at the same speed, 1 year will have passed for me, but 10 years will pass for you on Earth. We both experience one second the same, but when we join again, we will be separated by 9 years.

Even though you probably already knew this, I just love to think about it.