These Rings Were Discovered in 1855—But We’re Still Puzzling Over Them
These are called Liesegang rings. You’ve probably seen them on paper, in rocks and cliffs around you, and in test tubes. They were first discovered back in 1855, and we’re still working out the details. Learn (roughly) what makes these things happen. Liesegang rings are, in the grand tradition of science, not named after the…