Can you spot all of the differences in the pictures?
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Although it was just a byproduct of developing a new type of reactor, the generation of electricity from nuclear energy signaled a bright future ahead
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Only seven spade-toothed whales have ever been identified, and the species has never been seen alive. After one washed ashore last summer, researchers have made new discoveries—including that the animal had nine stomach chambers and vestigial teeth
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From an "awkward" smiling frog to embarrassing owl parents, this year's winners of the entertaining annual competition won't let you down
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The familiar rodents, known for eating nuts and seeds, have been spotted hunting and decapitating voles in a gruesome dietary adaptation. Scientists say it might signal resiliency in face of future environmental pressures
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This week, Browns Canyon National Monument, a 21,586-acre protected natural area in central Colorado, achieved International Dark Sky Park certification
