Page "Robert Andrews Millikan" Paragraph 3

Millikan's enthusiasm for education continued throughout his career, and he was the coauthor of a popular and influential series of introductory textbooks, which were ahead of their time in many ways.

Compared to other books of the time, they treated the subject more in the way in which it was thought about by physicists.

They also included many homework problems that asked conceptual questions, rather than simply requiring the student to plug numbers into a formula.