Sam McDougle

Actors Morgan Freeman and Scarlett Johansson star in the upcoming film "Lucy."

Morgan Freeman’s new movie says you use just 10 percent of your brain. But think again

A new movie is based on the premise — urban legend — that humans have huge reservoirs of untapped brain potential. But science says the reality is quite different.A new movie is based on the premise — urban legend — that humans have huge reservoirs of untapped brain potential. But science says the reality is quite different.