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In this article, the findings of selected observational studies are contrasted with that of randomised experiments conducted to estimate the impact of improved sanitation on child health in India. The estimation bias exists and could be due to the measurement error in sanitation indicators, which remained unaddressed by most observational studies. The sanitation indicators

It's a magical moment you snap hummingbird pictures in your yard. Here are some amazing pictures of hummingbirds captured on camera.

Scientists are warning that drinking water supplies in parts of rural West Africa are being contaminated by lead-containing materials used in community handpumps and public taps.

 E-Mail Scientists are warning that drinking water supplies in parts of rural West Africa are being contaminated by lead-containing materials used in small community water systems such as boreholes with handpumps and public taps. They analysed scrapings taken from the plumbing of 61 community water supply systems in Ghana, Mali and Niger. Eighty percent of the tested systems had at least one component that contained lead in excess of international guidance. Lead is released into the water when the components corrode. The study, by a research team from the University of Leeds, Un...