Why do our favorite songs evoke such strong emotions? Songwriter Scarlet Keys teaches the many methods musicians use to boost a listener's mood—or break their heart. Scarlet Keys is a professor ...

In 1892, the Mexican dictator Porfirio Díaz exiled Teresa Urrea from Mexico. He called her the most dangerous girl in Mexico. She was only 19 years old. Teresa Urrea was a “curandera,” or a healer, a ...