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.
Triton was discovered in 1846, a month after the discovery of Neptune. The other moons are Nereid, discovered from Earth in 1949, and Despina, Galatea, Larissa, Naiad, Proteus and Thalassa found by Voyager 2 in 1989. Three more small moons were discovered in 2002 and two more in 2003.