Photo by Ichiro, courtesy of Getty Images.

Copyright © 2006 Photo Researchers, Inc. All Rights Reserved. Used with permission.

Courtesy of National Human Genome Research Institute.

'Mobile generations' by Patrick Morgan, from the cover of <i>Nature Reviews Genetics, April 2006.

Courtesy of Bob Sheehy.

'Illumination' by Patrick Morgan, from the cover of <i>Nature Reviews Genetics</i>, June 2006.

Image by Brian C. Capell, courtesy of National Human Genome Research Institute.

From the cover of <i>Nature Reviews Genetics</i>, May 2004.

Copyright 2007 Nature Publishing Group. From Frank J. Poelwijk, F. J., Kiviet, D. J., Weinreich, D. M. & Tans, S. J. Empirical fitness landscapes reveal accessible evolutionary paths. <i>Nature</i> 445, 383-386 doi:10.1038/nature05451

Copyright © 2008 Photo Researchers, Inc. All Rights Reserved. Used with permission.