The following caught my eye in today's Weekly News from Science: Can epigenetics explain homosexuality puzzle? Michael Balter A new study suggests that epigenetic effects-chemical modifications of the human genome that alter gene activity without changing the DNA sequence-may sometimes influence sexual orientation. Researchers studied methylation, the attachment of a methyl group to specific regions of DNA, in 37 pairs of male identical twins who were discordant---meaning that one was gay and … [Read more...]