When you think about tattoos, what comes to mind — snakes, hearts, flowers, Celtic knots, mermaids, or the name of a true love? Well, what if that true love is science? It turns out a lot of scientists have inked their life’s passion on their bodies – a double helix on a leg, a galaxy on a shoulder, an Einstein equation boldly marked on the forearm. These are just a few examples of the kind of incredible body art that appears in CARL ZIMMER’s book “Science Ink: Tattoos of the Science Obsessed.” Zimmer began collecting pictures of science tattoos after he posed a question about them on his blog and was surprised with the number of images he began receiving and from every field — chemistry, biology, geology, astrophysics, medicine, paleontology. In this hour, Marty talks with Zimmer about these brainy tattoos and the science and stories behind them. We’ll also meet Philadelphia body artist MANDY SAULER who also specializes in medical tattoos for breast cancer patients.