A likely possible origin of homochirality in amino acids and sugars on prebiotic earth

For life to start on earth and elsewhere, it is critical that the building blocks-amino acids and sugars-be in predominant homochiral form. Over the past century, the origin of terrestrial prebiotic homochirality has been the subject of many speculations. In this Letter I summarize the experimental evidence for ways in which some meteoritic components could have led to the dominance of l amino acids and d sugars on earth, and the most likely way in which the original chiral excesses in the meteorites were formed.