Physics Professor Elbio Dagotto has written a review of new iron-based superconductors for the journal Reviews of Modern Physics. In his detailed colloquium citing hundreds of references, Dagotto points out how research into high-temperature superconductors has steadily advanced in a short period of time. With deeper investigations into the alkali metal iron selenides, which appeared just three years ago, scientists are challenging prevailing ideas about the pnictides, which is still a young field. To read a feature on his review, visit the Department of Physics and Astronomy website.