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The Associated Press
AP Top Science News At 5:23 p.m. EST

El Nino finally here; but this 1 is weak, weird and late
AP Photo
WASHINGTON (AP) -- A long anticipated El Nino has finally arrived. But for drought-struck California, it's too little, too late, meteorologists say....

Mysterious dwarf planet Ceres gets ready for the spotlight
AP Photo
LOS ANGELES (AP) -- The mysterious dwarf planet Ceres is ready for its close-up....

WHO to begin large-scale testing of Ebola vaccine in Guinea
AP Photo
LONDON (AP) -- The World Health Organization will start large-scale testing of an experimental Ebola vaccine in Guinea on Saturday to see how effective it might be in preventing future outbreaks of the deadly virus....

Mouse study finds extra oxygen may spur tumor-fighting cells
WASHINGTON (AP) -- A provocative study in mice suggests something as simple as breathing in extra oxygen might give immune cells a boost in attacking cancer....

Fossil jaw sheds light on turning point in human evolution
NEW YORK (AP) -- A fragment of jawbone found in Ethiopia is the oldest known fossil from an evolutionary tree branch that eventually led to modern humans, scientist reported Wednesday....

'Superbug' infections hit another Los Angeles hospital
LOS ANGELES (AP) -- A second Los Angeles hospital is reporting that patients have been infected with an antibiotic-resistant "superbug" linked to a type of widely used medical scope....

UK scientists work out weight of Sophie the Stegosaurus
LONDON (AP) -- Scientists at a British museum have worked out the living weight of Sophie, one of the world's most complete Stegosaurus skeletons....

UN: World eating too much sugar; cut to 5-10 percent of diet
LONDON (AP) -- New guidelines from the World Health Organization are enough to kill anyone's sugar high. The U.N. health agency says the world is eating too much sugar and people should slash their intake to just six to 12 teaspoons per day - an amount that could be exceeded with a single can of soda....

NASA investigating short circuit on Mars rover Curiosity
PASADENA, Calif. (AP) -- The Curiosity rover has temporarily stopped work on Mars while NASA engineers investigate a short circuit....

NASA spacecraft making first visit to dwarf planet Ceres
PASADENA, Calif. (AP) -- A NASA spacecraft is about to reach the end of a nearly eight-year journey and make the first rendezvous with a dwarf planet....