stories trends online. an expert says several factors could have caused the air crash in afghanistan early this week. the u.s. civilian operated cargo jet plunged into the ground shortly after takeoff from bagram air base. all seven people on board were killed. a solar-powered airplane is traveling across the country without using a single drop of fuel. it landed in phoenix this morning after takeoff from san francisco on the first legs of its journey. the solar impulse is considered the world s most advanced sun powered plane. and pepsico is dropping rapper lil wayne over some offensive lyrics. the singer made a derogatory reference to emmitt hill in his song karate chop. it s not exactly a cash crop. that s what some growers say about marijuana. we take you inside a pot growing business. and this programming note, the next anthony bourdain, head