When the Nobel Prize in chemistry was awarded for the discovery of green fluorescent protein (GFP) in 2008, the Nobel Committee called GFP a guiding star for biochemistry enabling processes that were previously invisible, such as cancer cells spreading, to be strikingly visible. Marc Zimmer, has written a glowing accountof how GFP and its red, blue, yellow and orange cousins have revolutionized bio-medical research and enabled every major disease, both cause and effect, to "light-up" in the laboratory for researchers to visualize, understand and eventually conquer them. This exciting and landmark book on the wonderful story of GFP is written with great clarity, warmth and for everyone.