Chemists have long conceptualized tiny machines that could fabricate drugs, plastics, and other polymers that are hard to build with bigger tools.
DAVID LEIGH DREAMS of building a small machine. Really small. Something minuscule. Or more like … molecule. “Chemists like me have been working on trying to turn molecules into machines for about 25 years now,” says Leigh, an organic chemist from the University of Manchester in the United Kingdom. “And of course, it’s all baby steps. You’re building on all those that went before you.”