Pardon if this is posted already but the Flash presentation at the source is just awesome.

Wow - this is truly a learning experience! Thanks, arifsali

Sorry; this is not true. We can see only a small part of the spectrum, we cannot see the "black matter" and we do not know what the "black matter" Is. We do not know the nature off the small particles (i.e. electrons protons .... etc) is it waves or matters.