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This article explains that some of the earliest creatures to crawl out of the ocean onto land half a billion years ago borrowed shells to carry a bit of the sea with them, allowing them to survive in an otherwise hostile world. This is conclusion of a study conducted by paleontologist James Hagadorn of Amherst College in Massachusetts, who has been studying fossilized tracks left in sandstone in central Wisconsin, dating back 490 to 510 million years.

Editorial. Looks at the pressure on teachers in the United States from religious groups, concerning the topic on evolution. Reference to the National Academy of Sciences' guidebook entitled `Teaching about Evolution and the Nature of Science'; Answer to the question why creation science cannot be taught in schools.

Highlights the evolutionary lines of dogs reported by Carlos Vila and colleagues at the University of California at Los Angeles in `Science.' Sequencing of DNA from dogs, wolves, coyotes, and jackals; Variability in mitochondrial DNA of dogs suggesting long evolution.