I guess you mean "All known living organisms". in other words, those known on Earth. Why would it not be possible for life to have formed in some other places, with actually a right-handed molecular structure? Further, if this is actually possible, it could be that some forms of alien life, if we encountered it, could be extremely dangerous for both us and them, because if we somehow got some right-handed genetic material mixed up with our left-handed material, the consequence could be massive catastrophe for all life in the local vicinity as we know it, giving us an even bigger, less solvable problem than we currently have with the global energy problem.

As things move on, surely we should realise we are seeing a recurring theme of learning the hard way how a little information and knowledge can be quite dangerous. So for survival, we have to really keep expanding knowledge. Its cool you seem to be all for that, I like what you do, mostly. Thanks for posting more great information.