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Global health researchers are working on cheap systems like a home-based pregnancy test that might work for malaria, diabetes or other diseases. A new chemical technique makes medically interesting molecules stick to regular paper — a possible route to building such paper-based diagnostics from paper you could buy at an office-supply store.

A tiny digital tag developed at the 91̽»¨can for the first time see when birds meet in the wild, offering a window into animal social networks. A study in Current Biology used the tags to track the social habits of New Caledonian crows, and found a surprising amount of interaction among the tool-using birds.