Keith Perkins, foreground, works through an algorithm for calculating ladder rung spacing in Linn-Benton Community College’s math for welders class. Credit: Jan Sonnenmair for The Hechinger Report The ...

At most colleges there's only one thing less popular than a calculus class: a 9 a.m. calculus class. But on a recent morning at Williams College, all 50-odd seats are filled as Edward Burger teaches ...