The Handedness of the Universe: Why Life Is Left-Handed Because Spacetime Is

This essay proposes that the homochirality of life on Earth (L‑amino acids, D‑sugars) is not an accidental outcome of terrestrial evolution, nor a relic of extraterrestrial delivery (as shown by the racemic mixtures on asteroid Bennu). Instead, it is a geometric consequence of the Cosmic Mesh — a discrete elastic tetrahedral FCC lattice that constitutes spacetime. The Mesh has an intrinsic chiral bias inherited from the Great Unknotting (the transition from the maximally knotted Great Knot to the expanding universe). This chiral bias propagates across scales: it determines the tetrahedral coordination of carbon (sp³), the stereoselectivity of RNA (Tamura‑Schimmel model), and ultimately the handedness of life. The “interstellar gardener” hypothesized by Avi Loeb is not a being, but the geometry of breathing spacetime. In the next cosmic cycle, the Mesh will exhale with opposite handedness, giving rise to mirror life (D‑amino acids, L‑sugars). The essay connects modern cosmology, prebiotic chemistry, and ancient oral traditions (the tetrahedron as Meru, Flower of Life, Tetractys), arguing that the same geometric pattern repeats across all scales.