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C-sections by trained health officers a safe alternative 'Cellular barcoding' reveals how breast cancer spreads Newly isolated human gut bacterium reveals possible connection to depression Earth's magnetic shield booms like a drum when hit by impulses Natural selection and spatial memory link shown in mountain chickadee research Pitt bioengineers create ultrasmall, light-activated electrode for neural stimulation Study on measles transmission in China have implications for controlling the epidemic worldwide 
