Robert Verne:"A developing fetus goes through certain distinct phases. Each phase represents a specific stage of evolution. A human fetus, for instance. At one stage, it's a fish. It looks like a fish; it's got fins and gills. At another, it's amphibian—webbed hands; at another, reptilian; at another, it's feline—developing upward in the distinct shapes and phases of the evolutionary scale. If this chemical, methylmercury, adheres to the DNA—DNA's a chromosomal fixative—it could freeze certain parts at one ev"