Tiny swimming donuts deliver the goods

Bacteria and other swimming microorganisms evolved to
thrive in challenging environments, and researchers struggle to
mimic their unique abilities for biomedical technologies, but
fabrication challenges created a manufacturing bottleneck.
Microscopic, 3-D-printed, tori—donuts—coated with nickel and
platinum may bridge the gap between biological and synthetic
swimmers, according to an international team of
researchers.