Charles Hatfield, the rainmaker, checking some equipment. (Copyright Bettmann/Corbis / AP Images)

When San Diego Hired a Rainmaker a Century Ago, It Poured

After Charles Hatfield began his work to wring water from the skies, San Diego experienced its wettest period in recorded history.
Project Implicit Racial Prejudice

Project Implicit Reveals Your Hidden Prejudice

Professor Anthony Greenwald invented the Implicit Association Test that can tap into our implicit feelings about race. What happens when people take it?