The Disabled Rights Movement and the Pennsylvania Coalition of Citizens with Disabilities.

At 19, Jim McGowan was the victim of an assault which left him with paralyzed legs. He later worked as an R&B singer in the 1950s with the group the Four Fellows, whose song "Solider Boy" was a number one hit. He late became an academic and has written a book about an Underground Railroad figure in "The Life and Letters of Thomas Garnett," as well as a history of R&B. He is also an activist for disabled persons and was the photographer for the book "Wheelchair Champions."

Washington Post reporter Todd Frankel explains how the AR-15 was adapted from the M16 military combat automatic rifle, and how it became an icon of gun culture and a favored weapon for mass shooters.

New York Times journalist Jeremy Peters explains Dominion Voting Systems' $1.6 billion lawsuit against the network. "Legal experts tell me that rarely have they seen a case this strong," he says.