On April 7, 1966, the U.S. Navy recovered a hydrogen bomb that the U.S. Air Force had lost in the Mediterranean Sea off Spain following a B-52 crash.

Ten years ago:

A suicide attack in a Shiite mosque in Baghdad killed 85 people. Tornadoes in Tennessee killed a dozen people. Dena Schlosser, charged with killing her infant daughter Margaret by cutting off her arms in what her lawyers portrayed as a religious frenzy, was found not guilty by reason of insanity by a judge in McKinney, Texas.

Five years ago:

A man shot and killed 12 children at the Tasso da Silveira public school in Rio de Janeiro; the gunman, a onetime student at the school, shot and killed himself after being cornered by police. A powerful aftershock struck Japan near the same area that had been devastated by a mighty earthquake and tsunami nearly a month earlier; no giant wave or loss of life was reported.

One year ago:

President Barack Obama, speaking at Howard University Medical School, announced commitments from Google, Microsoft and others to help the nation’s health system prepare for a warmer, more erratic climate. The University of Connecticut’s women’s basketball team beat Notre Dame 63-53 for its 10th NCAA championship. Stan Freberg, 88, the spirited comic genius who was hailed as the father of the funny commercial, died in Santa Monica, California.

— By The Associated Press