Lisa Marie Presley, the only child of Elvis and Priscilla Presley, died Thursday after a brief hospitalization. She was 54 years old. Presley, who was 9 years old when her father died in 1977, staked out her own musical career.

Federal scientists announced that they created the first-ever nuclear fusion reaction that generated more energy than it took to produce. Energy Secretary Jennifer Granholm called the breakthrough “one of the most impressive scientific feats.