charles darwin tattoo

Image of the Day: Inked-in Injury Tattoos are made permanent by a long-lived immune reaction, as immune cells that rush to heal the needle's marks absorb pigment particles, and remain trapped under the skin.

Darwin's Tree of Life. Drawing by Charles Darwin. I love the "I think" !

"I think" first evolutionary tree by Charles Darwin, in: red transmutational notebook B, 1936