Earth
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We summarize the week's scientific breakthroughs every Thursday.
- 			 Oceans OceansOcean heating doublesEarth’s oceans now absorb twice as much heat as they did 18 years ago, with more than a third of that warmth going into the ocean depths. 
- 			 Environment EnvironmentPCB levels still high in Europe’s killer whales, smaller dolphinsPCBs banned for decades still show up at extremely high concentrations in Europe’s killer whales and other dolphins. By Susan Milius
- 			 Earth EarthSuccession of satellites keep eye on Earth50 years after plans were laid for the first Earth-observing spacecraft, the youngest Landsat satellites are still flying and imaging the planet’s surface. 
- 			 Animals AnimalsThe moon drives the migration of Arctic zooplanktonIn the darkness of the Arctic winter, the moon replaces the sun as the driver of zooplankton migration, a new study finds. 
- 			 Cosmology Cosmology‘Origins’ offers science-based account of creationIn Origins, a science writer compiles an ambitious yet concise history of the universe and life on Earth. By Sid Perkins
- 			 Earth EarthGround shakes expose faraway earthquake hot spotsA major earthquake in Costa Rica revealed faraway areas where fluids have weakened rock and boosted the risk of a major earthquake, new research suggests. 
- 			 Oceans OceansPhytoplankton flunk photosynthesis efficiency testNutrient-poor ocean waters make phytoplankton photosynthesis inefficient 
- 			 Earth EarthFive things science can (and can’t) tell us about North Korea’s nuclear testNorth Korea’s claim about its recent nuclear bomb test isn’t entirely backed up by scientific evidence. 
- 			 Science & Society Science & SocietyClimate, new physics and Jupiter on the horizon for 2016The first issue of the new year features stories about what will, editor in chief Eva Emerson predicts, hold on as scientific newsmakers during 2016. By Eva Emerson
- 			 Climate ClimateArctic passageways let species minglePeople aren’t the only animals likely to use passages that open up as the Arctic melts. By Susan Milius
- 			 Physics PhysicsThe science of avalanchesHigh-tech instruments are helping researchers study how temperature can change the character — and danger — of an avalanche 
- 			 Physics PhysicsHalo of light crowns AntarcticaIce crystals in the air bend sunlight into a ring over a research base in eastern Antarctica.