Why does life prefer one “hand” over the other? New study points to electron spin
Peer-Reviewed Publication
Updates every hour. Last Updated: 27-Apr-2026 12:16 ET (27-Apr-2026 16:16 GMT/UTC)
Researchers uncover a mechanism that may explain why biology consistently selects one molecular form over its mirror image. A new study suggests that life’s long-standing preference for one “handed” version of molecules, known as homochirality, may stem from a subtle quantum effect: electron spin. Researchers found that when electrons move through mirror-image molecules, their spin interacts differently with each form, causing small but meaningful differences in behavior during dynamic processes like chemical reactions or electron transport. Although these molecules are chemically identical in static conditions, this spin-driven asymmetry could make one version consistently more efficient over time, gradually leading to the dominance of a single “hand” in biology. The findings point to a surprising role for quantum physics in shaping the fundamental structure of life.
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