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We summarize the week's scientific breakthroughs every Thursday.
- 			 Earth EarthEarly animals couldn’t catch a breathLow levels of oxygen may have hindered evolution of animal life hundreds of millions of years ago. 
- 			 Environment EnvironmentOil from BP spill may be sitting on seafloorMore than four years after the Deepwater Horizon disaster in the Gulf of Mexico, scientists find that oil is still lingering over a large area on the seafloor. By Beth Mole
- 			 Paleontology PaleontologyAncient jellyfish suffered strange, sandy deathA fossil hints at the unusual series of events that led to an ancient jellyfish’s preservation and may offer clues to understanding odd sand deposits found elsewhere. 
- 			 Animals AnimalsSouthern birds may be moving into your winter backyardA warming climate is letting warm-adapted birds live farther north in winter, a new study finds. 
- 			 Environment EnvironmentNo water contamination found in Ohio’s fracking epicenterMethane in Ohio groundwater comes from biological sources, such as bacteria, not fossil fuel exploration. 
- 			 Environment EnvironmentEngineered plants demolish toxic wasteWith help from bacteria, plants could one day clean up polluted sites. By Beth Mole
- 			 Physics PhysicsFalling raindrops break terminal velocityUnknown mechanism causes tiny raindrops to fall faster than terminal velocity. 
- 			 Climate ClimateRivers may gush under sullied skiesBy dimming sunlight and curbing evaporation, air pollution can increase the amount of water flowing through rivers, new simulations suggest. By Beth Mole
- 			 Environment EnvironmentWorld’s first full-scale clean coal plant now up and runningAfter decades of delays, technology that cuts carbon emissions from commercial power plants has made its worldwide debut. 
- 			 Ecosystems EcosystemsHelp scientists find floating forests of kelpBy looking for signs of kelp in satellite images, citizen scientists can help researchers keep track of the world’s seaweed forests. 
- 			 Environment EnvironmentHuman ingenuity takes on Mother Nature in ‘The Big Ratchet’Geographer Ruth DeFries explains how technological innovations have allowed humans to overcome environmental challenges throughout history. 
- 			 Animals AnimalsLacking ice, huge walrus herd congregates on Alaska shoreA large group of walruses has hauled out on the beach near Point Lay, Alaska. The animals have been forced onto shore due to a lack of sea ice in the region.