Chirality is an essential property in biology; the molecular building blocks of some of the most important biological structures, including DNA and proteins, are chiral. When a molecule is said to be chiral, it means that it is distinguishable from its mirror image, much like how one's left hand cannot be superposed onto the right hand. Interestingly, chirality can also affect how a molecule or a molecular aggregate emits or responds to light, especially circularly polarized light.