Achieving left and right handedness for life. Use electrons with handedness:-http://www.scientificamerican.com/article/weak-nuclear-force-shown-to-give-asymmetry-to-biochemistry-of-life/?WT.mc_id=SA_DD_20140926-Filled with coulda, woulda, mighta processes. No real answer. As usual the headline is much more positive than the story.