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.
May 17, 2013. This image of Neptune was taken during the August 16-17, 1989, period as Voyager 2 photographed the planet almost continuously, but had no way to measure the winds or how deep they reach into the atmosphere. Now, scientists have turned to subtle changes in the planet's gravity for clues.