  The origin of bio-homochirality is a subject of much debate. The emergence of
chirality and life on earth is a break of symmetry to be compared with the
breaks of symmetry in the evolution of the universe. Based on a perspective of
asymmetry transfer, the chirality at molecular level might stem from electron
spin at subatomic level. Accordingly, in this paper a spin-induced chiral
selectivity (SICS) mechanism and its outreach are introduced and discussed. The
stress force or spin torque derived from quantum electrodynamics (QED) might be
the driving force for the transfer of asymmetry and the formation of molecular
chirality. Some recent experimental results seem to support the SICS
conjecture. If spin-polarized electrons (SPEs) did cause life to become
chirally selective, a magnetic half-metal material such as greigite (Fe3S4), a
mineral present in a primordial site where life could have emerged, might act
as a spin filter to produce SPEs, which then induced the asymmetric synthesis
of chiral molecules via the SICS mechanism. All these tentative thoughts may
help explain how homochirality and life could have arisen on the early Earth.
