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16.1: Tutorial: Genetic drift

This tutorial reviews the process by which the genetic makeup of a population fluctuates randomly over time and causes populations to evolve.

16.2: Tutorial: Natural selection

This tutorial explores the process by which some individuals, because of particular inherited characteristics, survive and reproduce at higher rates than do other individuals.

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W. W. Norton & Company has been independent since its founding in 1923, when William Warder Norton and Margaret D. Norton first published lectures delivered at the People's Institute, the adult education division of New York City's Cooper Union. The Nortons soon expanded their program beyond the Institute, publishing books by celebrated academics from America and abroad. By mid-century, the two major pillars of Norton's publishing program—trade books and college texts—were firmly established. In the 1950s, the Norton family transferred control of the company to its employees, and today—with a staff of 400 and a comparable number of trade, college, and professional titles published each year—W. W. Norton & Company stands as the largest and oldest publishing house owned wholly by its employees.