Erica Klarreich has been writing about mathematics and science for more than a decade. She has a doctorate in mathematics from Stony Brook University and is a graduate of the Science Communication Program at the University of California, Santa Cruz. Her work has been reprinted in “The Best Writing on Mathematics 2010” and “The Best Writing on Mathematics 2011.”

### Graph Isomorphism Vanquished — Again

Just five days after posting a retraction, László Babai announced that he had fixed the error in his landmark graph isomorphism algorithm.