Ecologists in England and Scotland, collaborating with ecologists Christopher Sutherland and Joseph Drake at the University of Massachusetts Amherst, report this week on a new method of identifying an “entire community of mammals” – including elusive and endangered species that are otherwise difficult to monitor – by collecting DNA from river water.

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It's an unconscious tic we do dozens of times a day. Texas A&M experts explain why you shouldn't touch your eyes, nose and mouth, and offer advice for breaking the habit.

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