An iceberg that likely calved from Jakobshavn Isbrae, the fastest glacier in western Greenland. Ian Joughin/Science/AAAS hide caption

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Can You Tell Emotion From Faces Alone? A new study suggests that when people evaluated just facial expressions — without cues from the rest of the body — they couldn't tell if the face was showing a positive or negative emotion. Enlarge this photo to see the answers. Hillel Aviezer/The Hebrew University of Jerusalem hide caption

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The taste of Mock's tomatoes starts with the seed. He uses only organic varieties, including cherry and several heirloom varieties. Allison Aubrey/NPR hide caption

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Researchers say they have identified traces of ice in craters on Mercury, seen here in this Oct. 8, 2008, image from the Messenger spacecraft. NASA hide caption

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The seeds of this goosefoot plant are known as quinoa, a superfood now in high demand and grown almost exclusively in South America. But some growers think they have the formula to grow it up north. Janet Matanguihan/courtesy Kevin Murphy hide caption

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