Many of us self diagnose or joke about having ADD, but a new study reveals that there are about one million misdiagnosed ADHD cases in the U.S. And the group most misdiagnosed? Children who are the youngest in their class. We go behind the headline tonight.

The good news, Toronto homicides are down. But, and here's the bad news, the number kids killing kids is up. What's happening here?

Maureen Basnicki lost her husband in 9/11. Tonight, she joins us to share her thoughts on the mosque and Islamic cultural centre in development two blocks away from Ground Zero.

Plus, favourites "What in the World" and Mark's disconnect for the day. Tune in tonight, 8:00 p.m. ET live.