Leap years show that humans may have an odd way of measuring time. Sometimes, timekeepers even have to add extra seconds to ...

Christopher Columbus' actions have been much scrutinized. Less attention has been paid to his writings, and what they reveal about his motivations.

Clark focused on how we came to define historical eras, as well as forgeries and frauds, as part of his research on the ...

The bright colors glowing from smartphones and television screens rely in part on molecules developed by USC chemist and University Professor Mark Thompson. That work has now earned Thompson ...