The May 19 graphic “Pathways to Pain” described migraine pain as caused by swollen blood vessels that rub against nerves in the brain. Scientists say the key problem is not friction but the inflammation that occurs when swollen vessels release proteins into surrounding tissues.

Correction

In “The News Not Fit To Print” (May 26), we said that Ruth Shalit, a former writer for The New Republic, “admitted to plagiarizing passages and fabricating facts.” In fact, Shalit (who later rejoined The New Republic for two years) never admitted to any fabrication. NEWSWEEK regrets the error.