In 1972 Gould took the scientific world by storm with a paper on punctuated equilibrium that launched the controversial idea that the majority of species originate in geological moments (punctuations) and persist in stasis. Here he offers a book-length testament on a theory he fiercely promoted, rep...

In 1972 Gould took the scientific world by storm with a paper on punctuated equilibrium that launched the controversial idea that the majority of species originate in geological moments (punctuations) and persist in stasis. Here he offers a book-length testament on a theory he fiercely promoted, repeatedly refined, and tirelessly defended.