Undergraduate students across North America sat down on Saturday to write a grueling six-hour math exam, many of them unlikely to solve a single problem. The notoriously brutal William Lowell Putnam ...

Chris Neiger has 10+ years of experience writing for both print and online publications. His work has appeared in the BBC, The Motley Fool, and AOL. Yarilet Perez is an experienced multimedia ...

Valerie Cacho, MD, is a board-certified sleep medicine specialist and the founder of the online educational company Sleephoria. Adults typically need at least seven hours of sleep per night to ...