Hate to break up this little back and forth, but have they (physicists) figured out why such things as light act as both particles and waves at certain times?
That's where I got my question from. I haven't seen that for a few years, but that question always stuck. How, or why electrons can have properties of both particles and waves baffles me. Particles, being particles, have mass and therefore shouldn't be able to travel at the speed of light. Light can't exhibit properties of particles because then it shouldn't be able to travel at the speed of light!
Why would the particle act differently just because it is being observed? A mind of its own maybe? :blink:
As Jack mentioned, it's a concept in quantum mechanics known as wave / particle duality. You've probably seen the double-slit experiment videos. If you haven't yet seen a documentary called "What the Bleep Do We Know?" I highly recommend it. It's a very good introduction to basic concepts like that. Not that the concepts are basic -- but they're introductory to quantum mechanics.
I don't pretend to understand it myself. And my own personal musings have no basis in science -- not yet anyway. I'm an arm-chair physicist, and make no claims to be an expert, just an interested party.

Personally, I think the observation effect on quanta of light has something to do with unpotentiated realities. That is, all things unseen and unobserved are in a state of infinite probability. When they are observed, the state resolves into a finite and discrete outcome. That's on the quantum particle level -- not like, on cows and [censored]. Anyway, just my personal belief from theories I've heard. Then there's spiritual stuff mixed in, when never flies well in a scientific discussion.