mistaken. The Columbian Exchange had such far-reaching effects that some biologists now say that Colon's voyages marked the beginning of a new biological era: the Homogenocene. The term refers to homogenizing: mixing unlike substances to create a uniform blend. With the Columbian Exchange, places that were once ecologically distinct have become more alike. In this sense the world has become one, exactly as the old admiral hoped. The lighthouse in Santo Domingo should be regarded less as a celebration of the man who began it than a recognition of the world he almost accidentally created, the world of the Homogenocene we live in today.