Science: Universal Enemy

On the border line between the living and nonliving hovers a mysterious invisible substance: the virus. Some scientists think the virus is the most primitive form of life; others insist it is a heavy protein molecule, with complex chemical reactions, a kind of crystal which exists as a parasite on living tissue. But whatever the nature of the virus, one fact is certain: it is the foe of all living things, from microbe to man.

Last week famed Biologist Kenneth Manley Smith of Cambridge University published a full account of this hostile force called...

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