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We summarize the week's scientific breakthroughs every Thursday.
- 			 Earth EarthFederal budget’s new ‘black book’The administration details a proposed $17 billion in budget savings in a new book. By Janet Raloff
- 			 Earth EarthU.S. radiation dose has doubledNew analysis finds radiation-based medical procedures have skyrocketed. By Janet Raloff
- 			 Earth EarthReport of earlier, longer puberty in girlsA Danish study finds young girls are entering puberty notably earlier than 15 years ago — for reasons that remain unknown. By Janet Raloff
- 			 Health & Medicine Health & MedicineScience budgets look rosy, AAAS findsThe president and Congress have collaborated in targeting substantial increases for federal investments in R&D this year. By Janet Raloff
- 			 Climate ClimateOn federal science — and science spendingThings you might have gleaned at the AAAS Forum on Science and Technology Policy. By Janet Raloff
- 			 Earth EarthA limit for carbon emissions: 1 trillion metric tonsTo reduce risks of severe damage from climate change, humans should burn no more than 1 trillion tons of carbon in total, researchers suggest. By Sid Perkins
- 			 Plants PlantsClimatic effects of tree-killing hurricanesA new analysis suggests storm damage returns millions of metric tons of carbon dioxide to the atmosphere each year. By Sid Perkins
- 			 Physics PhysicsObama pledges 3 percent of GDP for researchPledges for big budget increases for research, permanent tax credits for reseach by industry and more were announced today. By Janet Raloff
- 			 Ecosystems EcosystemsLiving PhysicsFrom green leaves to bird brains, biological systems may exploit quantum phenomena. By Susan Gaidos
- 			 Plants PlantsLandscaper’s darling hybridizes into an environmental nuisanceVariation underlies the Callery pear tree’s transformation . By Susan Milius
- 			 Earth EarthA little air pollution boosts vegetation’s carbon uptakeAerosols bumped up world’s plant productivity by 25 percent in the 1960s and 1970s, new research suggests. By Sid Perkins
- 			 Earth EarthFossil of a walking seal foundA fossil skeleton discovered in the Canadian Arctic could represent a missing link in pinniped evolution.