The answer – fewer than are in a banana – has implications for the study of human health and raises questions about what generates complexity anyway.
Poor testing methods and antibiotic use by GPs and urologists has left thousands of women with crippling infections.
Bacteria can produce their own 'buildings' so scientists are genetically engineering them to build ours.
The vast majority of the bacteria that surround us are not free-floating but prefer to band together in cooperative communities called biofilms. How do biofilms form and cooperate?