Princeton University researchers found that the banana-like curve of the bacteria Caulobacter crescentus provides stability and helps them flourish as a group in the moving water they experience in nature. The findings suggest a new way of studying the evolution of bacteria that emphasizes using naturalistic settings. The illustration shows how C. crescentus divides asymmetrically into a "stalked" mother cell that anchors to a bacterium's home surface, and an upper unattached portion that forms a new, juvenile cell known as a "swarmer." Swarmer cells later morph into stalked cells and lay down roots nearby. They repeat the life cycle with their own swarmer cell and the bacterial colony grows. The Princeton researchers found that in moving water, curvature points the swarmer cell toward the surface to which it needs to attach. This ensures that the bacteria's next generation does not stray too far from its progenitors.