Heads up: is there a hidden concussion problem among athletes? Under pressure, the NFL changed its policy on when players may return to games after suffering concussions. But some are concerned that the culture of playing through concussions in the NFL remains, and has filtered down to colleges and high schools. And football isn't the only sport seeing an increase in head injuries.9:06 a.m.
Chris Nowinski: Co-founder of the Sports Legacy Institute and co-director of the Boston University Center for the Study of Traumatic Encephalopathy. He is also the author of "Head Games: Football's Concussion Crisis."
Ann McKee, MD: Associate professor of neurology and pathology at Boston University and co-director of the Boston University Center for Traumatic Encephalopathy.
Mary Griffith: Director of outpatient services at the Bethesda Concussion Clinic in St. Paul.
Psycho's impact on the movies Ask most people, particularly those over 40, about the most frightening movie moment ever and they'll respond with the shower scene from Psycho. When Janet Leigh met her famous screen death nearly 50 years ago, a new age in movie violence began. A new book puts Alfred Hitchcock's iconic film in cultural perspective.10:06 a.m.
David Thomson: Author of the "The Moment of Psycho: How Alfred Hitchcock Taught America to Love Murder."