Why a Giant Machine Is Digging a Tunnel Under D.C.

July 3, 2014 -- A colossal machine called the "Lady Bird" is boring a huge tunnel under Washington, D.C., to channel storm water for treatment, keeping runoff out of the city's notoriously polluted rivers. The $30 million machine is named for Lady Bird Johnson, who, as First Lady of the United States, had advocated for cleaner rivers around the nation's capital.

To learn more about the "Lady Bird" and the tunnel it's digging, click here.