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Marriage starts with a promise to grow old together — but couples like Ira and Roberta Almeas have instead decided to grow young together.

By Roberta Kwok of Nature magazine Researchers have equipped yeast cells with semi-synthetic chromosomes. [More]

By Roberta Rampton WASHINGTON (Reuters) - A U.S. task force examining the disaster at Japan's Fukushima Daiichi plant expects to find ways to improve safety at the country's 104 U.S. nuclear plants but has not found any major problems in its first 30 days of work

By Roberta Rampton WASHINGTON (Reuters) - The U.S. nuclear safety regulator is studying whether to require plants to more quickly move radioactive waste out of pools as part of a review on safety in the wake of Japan's nuclear disaster, its chairman said on Monday. [More]