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22.2: Activity: Diffusion in air and in water

This simple animation illustrates why lungs do not work well under water.

22.3: Tutorial: Hemoglobin picks up and delivers oxygen

This tutorial explores how hemoglobin picks up O₂ in the lungs and delivers it to tissues in the body.

22.1: Process Animation: Respiration Occurs in Mitochondria

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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.