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Science Friday
TWO AND MORE
Two butterfly species, the small heath (left) and common blue (right), have become more likely since 1980 to have multiple generations in Central Europe in the same year, as a long-term warming trend has picked up pace. Full Story Photos: F. Altermatt
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The First Sound Bites   New species in Papua New Guinea   Interactive Darwin Timeline
Hear Sound Recordings from the 1908 presidential campaign   See photos of frogs and spiders recently discovered   View key events and discoveries related to evolution
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