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Dima Alexandrov Does life have a meaning? Life, it might be argued, is the distinguishing feature of all organisms and may most usefully be thought of as involving various kinds of complex systems of organization providing individual organisms with the ability to make use of those energy sources available to them for both self maintenance and reproduction. Underlying this deceptively persuasive definition, however, lie those persistent traditional problems inherent in the search for an essential, distinctive substance characteristic of all forms of life. Additionally, as evolution theory makes clear, there is the problem of borderline instances, organisms of which it is not easy to say whether or not they may be defined as being alive. One such case is that of the virus. Viruses are the smallest, simplest living things, smaller than bacteria, and the cause of some of the deadliest diseases known to humanity. They are composed chiefly of nucleic...

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