(A-P) EMERSON, Neb. — Two people on a motorcycle have been killed in a head-on collision with a car near Emerson in eastern Nebraska. The Dixon County, NE,  sheriff’s office says that 20-year-old Christopher Oberg, of Mapleton, Iowa, and his passenger, 19-year-old Alexis Calfee of Bennett, Neb., died at the scene of Friday evening’s crash. The sheriff’s office says Oberg was heading westbound on the motorcycle when he encountered an eastbound car in his lane. He swerved but couldn’t avoid a crash. The driver of the car, identified as 55-year-old Robert Mahler, of Hubbard, Neb., was taken to an Iowa hospital. The crash is under investigatio