Life on Earth follows strict molecular rules. At the most fundamental level, biology relies on homochirality – the preference for one ‘handedness’ of molecules over the other. DNA and RNA are constructed from right-handed (D) nucleic acids, while proteins are assembled from left-handed (L) amino acids. Why nature chose this arrangement remains a mystery, but across every known organism, it has held as an unwavering law. But what if those rules were flipped? What if organisms were built ...
