Your Great-grandmother's Fear of Storks Helped Shape Your Biology

Back in the dawn of evolutionary theory Lamarck argued that the giraffe got its long neck by stretching to reach trees, its length from "the inherited effects of the increased use of parts." If you daily turn book pages with your big toe, will your future generations also do it? Lamarck and giraffe necks, like Freud and penis envy, is passé. Or is it?