All amino acids in proteins are left-handed, all sugars in DNA are right-handed. This homochirality was inherited by life from the cosmos. Schrödinger had pondered the origin of order, and Wu showed that the weak force distinguishes sides. Zwicky added that supernova explosions bombard everything with neutrinos. Now a model explains: a neutrino breeze, blowing for billions of years, gently nudged molecules toward one mirror form.

This nudge was minuscule, but chemistry amplified it: the arising imbalance accelerated its own growth, like a snowball starting an avalanche. In interstellar gas clouds at –170°C, a simulation confirmed that over 300 million years, a surplus of more than 10% left-handed molecules appears. The Murchison meteorite holds exactly this same excess.

This means that distant stellar explosions not only gave us our atoms but also dictated life's very architecture — across the Universe, it might turn out the same. Spectroscopes are already searching for confirmation.