Sex is a pretty primitive business, but it has so many downsides that its success is still a big evolutionary puzzle. (newscientist.com)
When University of Geneva biologist Michel Milinkovitch started studying naked bearded dragons, he just wanted to know why the lizards didn't have scales — he never expected to solve a major evolutionary puzzle. (discovermagazine.com)
The tetrapods» move to land has long been one of the great evolutionary puzzles. (discovermagazine.com)