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We summarize the week's scientific breakthroughs every Thursday.
- 			 Climate ClimateFlood planners should not forget beaversBeaver dams can reduce flooding downstream, new research shows. 
- 			 Microbes MicrobesPig farm workers at greater risk for drug-resistant staphPig farm workers are six times as likely to carry multidrug-resistant staph than workers who have no contact with pigs. By Beth Mole
- 			 Climate ClimateRate of atmospheric carbon dioxide rise unprecedentedThe current rate of carbon dioxide entering the atmosphere is unprecedented over at least the last 66 million years, new research shows. 
- 			 Astronomy AstronomyWandering planets, the smell of rain and more reader feedbackReaders consider how hard it would be to fashion Paleolithic tools, discuss what to call free-floating worlds and more. 
- 			 Physics PhysicsScientists take first picture of thunderScientists precisely capture thunder sound waves radiating from artificially triggered lightning. 
- 			 Animals AnimalsLazy sunfish are actually active predatorsOcean sunfish were once thought to be drifting eaters of jellyfish. But they’re not, new research shows. 
- 			 Physics PhysicsExplanation for G’s imprecision stumblesA surprising new result seems to suggest that subtle changes in Earth’s rotation rate could account for physicists’ difficulty in measuring Newton’s gravitational constant. But some confusion with dates appears to derail the finding. By Andrew Grant
- 			 Earth EarthCosmic rays illuminate lightningRadio waves emitted by particles zipping through thunderstorms allow physicists to probe thunderclouds and, perhaps eventually, learn what triggers lightning strikes. By Andrew Grant
- 			 Earth EarthStronger quakes could strike other segments of Nepal faultThe magnitude 7.8 earthquake that struck Nepal’s capital city could be overshadowed by larger future earthquakes along the Himalayas, scientists say. 
- 			 Ecosystems EcosystemsJust 1 percent of Amazon’s trees hold half of its carbonRoughly 1 percent of tree species in the Amazon rainforest account for half of the jungle’s carbon storage. 
- 			 Earth EarthHidden water found deep beneath Antarctica desert valleyNew imaging reveals liquid water network beneath Antarctica’s McMurdo Dry Valleys that could support microbial life. 
- 			 Climate ClimateWarming’s role in extreme weather quantifiedScientists calculate how much to blame human-driven climate change for extreme high temperatures and heavy rainfall. By Beth Mole