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Stories by Peter Ward

The Extinction of the Ammonites

Changes in the shells of these nautliuslike marine animals at the end of their long history suggest they were fighting a losing battle against more mobIle, shell-crushing predators

October 1, 1983 — Peter Ward

The Buoyancy of the Chambered Nautilus

The animal trims its weight and gains mobility by dividing its shell into compartments and removing their watery content. It succeeds in spite of the ocean's pressure, which tends to drive water back in

October 1, 1980 — Peter Ward, Lewis Greenwald and Olive E. Greenwald