Re: using beams of light to manipulate atoms.
But ( and I know I'm wrong about this, but that doesn't mean I understand ), if they're massless then the force they exert is their speed multiplied by zero?
Newtonian mechanics (F=mv) applies pretty well at non-relativistic speeds (i.e. anything travelling at under an appreciable fraction of the speed of light). Photons travel at the speed of light (in a vacuum, anyway), so Einstein's pesky general realtivity comes into effect, and those equations get a whole load more terms in them.
Biting the hand that feeds IT
