In his terrific new book Cosmic Apprentice: Dispatches from the Edges of Science (University of Minnesota Press) Dorion Sagan quotes David Bohm: "Science is the search for truth whether we like it or not." In other words, scientists are truthers. Unfortunately, few of them are as courageous - or as interesting - as Dorion, who mines the rich gradient separating scientific truth from human meaning better than anyone. It seems that Dorion has inherited his father Carl Sagan's talent for popularizing scientific ideas, and his mother Lynn Margulis's genius for re-thinking the science of life.

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