LYNN F. JACOBS and JEREMY S. HYMAN are college professors with a combined 50-plus years of teaching experience at eight different colleges, including the University of Arkansas, MIT, Princeton, UCLA, Vanderbilt University, and California State University, Northridge. They maintain a website at www.professorsguide.com, blog for U.S. News & World Report, and have contributed to blogs at The New York Times, Chegg, and Reader's Digest.