New techniques in ultra high speed photography can slow down movement a trillion times. That's a million faster than the bullet-through-the-apple photos of Harold "Doc" Edgerton and it's enough to see light moving through space.
(Video link) You can watch the ripples of light as they travel through space and interact with materials. "It's like throwing a stone in a pond of water," says MIT researcher Ramesh Raskar, who presented the video at a TED Global talk, and who will offer the techniques in an open source mode.
Thanks, Dan and BestofYouTube