text: Genesis Mission Samples Arrive at Space Center By PAM EASTON     HOUSTON (AP) -- Thousands of samples from the Genesis space capsule have arrived at the Johnson Space Center, where the project's curator must assemble a giant jigsaw puzzle that could hold clues to the origins of the solar system.    Wafers on five collector panels that broke into thousands of pieces when the capsule slammed into Earth last month secured samples of atoms and ions from solar wind...