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28.2 Tutorial: Recognizing and attacking invaders of the body

This tutorial explores the two main branches of the immune system—humoral immunity and cell-mediated immunity.

28.3: Tutorial: Why is AIDS so deadly?

This tutorial examines how HIV weakens the immune system by infecting macrophages and helper T lymphocytes, leaving the body open to attack by other invaders.

28.1: Process Animation: How Antibodies Work

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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.