The gist is that self-organized molecules (ie: life) will build themselves in a single chirality (organic molecules can exist in two mirror images, chirality is the term to distinguish them; think your right and left hands). Light that reflects from organics will contain a tell-tale signature (polarization) depending on the chirality. This could be used to detect evidence of "life" on other planets. Clever.
As all I see, hear, and feel is so tragic, I have become quite numb to it all; I shall die, grotesquely overweight, perversely content, having lived a life of flavor. - Anon.a.mouth[quote database]