Carl Zimmer 's new book She Has Her Mother’s Laugh makes...  ...ill). Where does one calf end and the other begin? Zimmer describes a bizarre twist on the free-martin: a g...

In 2007, science writer Carl Zimmer wondered how common science tattoos were. He said...  ...ngoing. That grew into a completely new blog, and Zimmer became known as the guy who collected science tat...  ...nk -via The Loom (Image credit: Science Ink by Carl Zimmer /Ster...