principle in Youtube(c)

Quantum Mechanics The Uncertainty Principle Light Particle's

http://www.myspace.com/acorvettes Single photons are the smallest quantities of light and, despite having no mass, have many properties in common with particles. In fact, physicists often think of photons as particles -- particles that sometimes behave like waves. Physicists sometimes describe all particles as waves -- even those with mass, such as electrons and protons -- in order to better understand certain aspects of their behavior.