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The important thing about Caenorhabditis elegans, also called a roundworm or nematode, is how simple it is. A mouse may be small, but it’s still a mammal, and composed of many billions of cells. Even a fruit fly is a relatively complex organism, and as scientists manipulate its genes they see all kinds of emergent properties arising from the incredible ...

Lalo Yasky/Getty Images Actors Margot Robbie and Will Smith attend an event for  ‘Focus’ in Buenos Aires, Argentina. It was the first time they had stepped out together since rumors circulated that Smith was cheating on his wife with Robbie. Will Smith and Margot Robbie are together again, but this time their clothes are firmly on. The co-stars stepped out ...

Ron Antonelli/New York Daily News Rangers winger Rick Nash says the headaches following his Oct. 8 concussion have faded. Though he sat out for practice, Rick Nash returned to the ice for the Rangers on Saturday afternoon, four-plus weeks after sustaining a concussion on Oct. 8. “I think when you’re dealing with the brain you always want to be careful,” ...