Leon Abelmann

"No problem is too small or too trivial if we can really do something about it." 

-- Richard Feynman.

Magneto-tactic bacteria align in the earth magnetic field. This allows them search for the bottom of ponds or marshes. In the lab, we can trick the bacteria with our own magnetic fields, and make them dance. Read more in this publication by Marc Pichel. This video won the 2014 MicroTAS video competition.