While reading Jonathan Weiner’s book – Time, Love, Memory, I ran across several topics that are quite controversial. I thought that the book did an excellent job of presenting the science of these subjects while remaining neutral. One such topic is the genetic component of homosexuality. Studies have shown a tenative link between certain genes and homosexuality. Other studies have shown no such link. The thing about genetics is that genes interact with one another in very complex ways. It has taken decades to work out the mechanism of genes involved in circadian rhythm, and new discoveries are still being made. Working out the genetic component of homosexualiy is going to be difficult, and until more is known about how genes influence sexual orientation I am going to withhold judgment as to how much of a role they play.