A 10-foot microscope reveals big lessons about the tiniest threats to the human body

There’s a technological revolution underway that’s making it faster and easier for scientists to see the molecules that undermine human health — and possibly fight the problem.

The “resolution revolution” involves cryo-electron microscopes, whose ever-improving detectors and software are producing three-dimensional images in unprecedented detail, aiding drugmakers.

They reveal detail so precise that biologist Andrew Ward, of Scripps Research in La Jolla, California, was able to spotlight...