May 22, 2013 — The Fed chairman cautioned Wednesday that if interest rates were to start rising now, the economy could slump. Meanwhile, the National Association of Realtors said sales of existing homes rose — and would have been even stronger if not for tight inventory.

May 22, 2013 — A measles epidemic in Wales that has infected more than 1,000 people is the fallout from a fraudulent paper linking the vaccine and autism published almost 15 years ago, health officials say. Many of the children and teenagers sick with measles were never vaccinated.

May 22, 2013 — Lois Lerner, who's at the center of the political firestorm over her agency's singling out of some conservative groups for extra scrutiny, invoked her Fifth Amendment right not to answer questions from Congress.

May 22, 2013 — Although scientists have known that a funguslike organism caused the potato blight that triggered the Great Famine in Ireland in the 1840s, they didn't know which strain was the culprit. But they do now, thanks to the genes in some 19th century potato samples.

May 22, 2013 — A friend of the man killed Wednesday in Orlando says the FBI was questioning the man about his connection to Tamerlan Tsarnaev, one of the men suspected of planting the bombs in Boston.