One way the study of epigenetics is revolutionizing our understanding of biology is by revealing a mechanism by which the environment directly impacts on genes.
But with many more women than men choosing to leave the workforce entirely to raise families, returning from an extended parental leave doesn't raise as many eyebrows as it does for men.
As shocking as this utter failure may be to the nearly 1 billion faithful Facebook users around the world, it's no surprise to anyone who read the initial public offering (IPO) prospectus.