Welcome to American Mosaic from VOA Learning English.I'm Kelly Jean Kelly.On the show today, we play unlucky music in honor of Friday the 13th!We also tell about a Muslim American rapper who sings about Jesus.But first, we take a boat ride across the Potomac River near Washington.Ferry boats once were an important method of transportation across rivers. There once were more than 100 ferries in operation on the Potomac River.That is the river that runs through the Washington, DC area and into the Chesapeake Bay on the eastern coast of the United States.All but one of the ferries have been gone for many years. The historic White's Ferry has served the DC area since the late 1700s.And the business is still doing very well. Faith Lapidus has more.