A representative model of the skeleton 'Lucy' at the opening of the new permanent exhibition at the National Museum of Ethiopia featuring Lucy the 3.4 million year old fossil on December 3, 2014.

The DNA assemblage is from a 4,500-year-old human skeleton. 

A South Pacific sea turtle. Getty Images

by Michael Lerner The Kermadec Ocean sanctuary will cover a biodiversity-rich range of underwater volcanoes.

Exercisers in a gym class.

Chance of returning to a normal weight is only one in 210 for men and one in 124 for women over a year, they say.

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Pneumonia can be a serious and common complication of catching the flu.

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U.K. surgeons are testing using stem cells in trials to find a cure for blindness.