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While the story of Cain and Abel does not specify the murder weapon used by Cain, traditional illustrations often show Cain wielding the jawbone of an animal (perhaps an ass-which is what Samson is said to have employed as a weapon). Assuming the traditional illustrations and the story are right, this would be one of the first uses of technology by a human-and, like our subsequent use of technology, one of considerable ethical significance. Whether the tale of Cain is true or not, humans have been employing technology since our beginning. As such, technology is nothing new. However, we are now at a point at which technology is advancing and changing faster than ever before-and this shows no signs of changing. Since technology so often has moral implications, it seems worthwhile to consider the ethics of new and possible future technology. This short book provides essays aimed at doing just that on subjects ranging from sexbots to virtual dogs to asteroid mining. While written by a professional philosopher, these essays are aimed at a general audience and they do not assume that the reader is an expert at philosophy or technology. The essays are also fairly short-they are designed to be the sort of things you can read at your convenience, perhaps while commuting to work or waiting in the checkout line.