But they don't know what causes this bias. I wonder what it could be...
Two theories I have heard;
Polarisation of light in interstellar space or elsewhere causes certain molecules to be favoured in certain regions; perhaps if the universe as a whole were considered the bias would even itself out.
Or
A bias in the very make up of our universe- in particular the parity violation in certain interactions
http://en.wikipedia.org/wiki/Parity_...rity_violation
Somehow, but I don't know if anyone knows quite how, this might bias the handedness of biological molecules all over the universe.