To many, cloning is the stuff of science fiction. However, for decades it has been an important piece of scientific development. This guidebook starts by looking at the foundational scientific theories that led to the exact replication of molecules, cells, and even organisms. Drawing on primary sources, this book gives biographical information on key players in the field of cloning and traces how their work built upon that of their predecessors, culminating in the successful cloning of a sheep. It looks at how cloning technology has advanced and is used today. Students will hone their critical thinking skills by exploring the ethical debate behind the use of cloning technology.