Evolution is traditionally associated with a process of increasing complexity and gaining new genes. However, the explosion of the genomic era shows that gene loss and simplification is a much more ...

Cyanobacteria began contributing oxygen to Earth's mostly noxious atmosphere more than 2 billion years ago. The photosystem ...

Strep throat, something we've all had at some point in our lives, is caused by the bacteria Streptococcus pyogenes. Infection by Streptococcus can be fatal in serious cases and is the leading cause of ...