In people with chronic myelogenous leukemia, the chromosomes in the blood cells swap sections with each other. A section of chromosome 9 switches places with a section of chromosome 22, creating an extra-short chromosome 22 and an extra-long chromosome 9.
Discovered on September 23, 1846, by John Couch Adams. Neptune was the first planet found by mathematical prediction rather than by observation. Unexpected changes in the orbit of Uranus led astronomers to deduce that its orbit was subject to gravitational perturbation by an unknown planet.
A New World: NASA Recalls Voyager 2 Probe's 1989 Neptune Encounter. NASA's Voyager 2 probe captured this image of Neptune five days before its historic flyby of the planet on Aug. 25, 1989. A quarter-century ago, the world got its first good look at the solar system's other blue planet. NASA's Voyager 2 spacecraft made the first-ever flyby of Neptune on Aug. 25, 1989, zipping by the ice giant and its frigid moon Triton in quick succession.