Feature: Graying Cuba strains socialist safety net
Cuba's biotech success helped give rise to a rapidly aging population; now, its scientists are hoping to ease the disease burden in the golden years
Latin America
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T. rex cousin was early convert to vegetarianism
Scientists find surprisingly precocious example of a meat-eating dinosaur that changed its diet -
Vultures surf on heat from power plants
Air currents from thermal power plants give birds a lift -
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Evidence of ancient river could rewrite geological history of the Americas
Volcanic deposits point to early link between North America and South America -
Heat-beating beans resist climate change
Newly tested varieties show promise in surviving higher temperatures -
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Ancient and modern cities obeyed same mathematical rule
Productivity rises faster than population, regardless of culture and time frame -
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Ice core suggests humans damaged atmosphere long before the industrial revolution
Colonial mines polluted South America centuries before coal and oil -
More monarch butterflies in Mexico, but numbers still low
Scientists see uptick in migration from U.S. but remain concerned about the future -
Climate change skeptic takes reins of Brazil’s science ministry
Appointment casts doubts on nation’s commitment to environmental issues -
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Giving cities a road map to reducing their carbon footprint
New standards for measuring urban greenhouse gas emissions unveiled at climate summit -
