Two stationary kinds of bacteria can move when mixed
Speed increases as pair evolves together, study finds
![Pseudomonas fluorescens](https://i0.wp.com/www.sciencenews.org/wp-content/uploads/2016/08/081216_SM_ASM-pseudomonas_main.jpg?fit=860%2C460&ssl=1)
ISO A PAL A Pseudomonas fluorescens bacterium (shown) and its colony get stranded when alone on dry surfaces, but mix in a different stationary species and evolution gets them moving.
Dr. Tony Brain/Science Source