A reconstruction of a Neanderthal man (right) based on skull found at the La Ferrassie rock shelter in Dordogne Valley, France. He's face to face with a male Homo sapien. Philippe Plailly & Atelier Daynes/Science Source hide caption

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Green when young, and about the size of an adult human's hand when full-grown, Dryococelus australis is more commonly known as the Lord Howe Island stick insect, or the tree lobster. Courtesy of Rohan Cleave/Melbourne Zoo hide caption

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More Americans across all ages are opting not to drive. Endai Huedl/Getty Images/fStop hide caption

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A lab worker exposes his arm to Aedes aegypti mosquitoes, which transmit Zika virus, during testing in the lab at Roosevelt Hospital in Guatemala City, Guatemala. Saul Martinez/Bloomberg via Getty Images hide caption

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While some scientists seek ways to stop the spread of Zika by mosquitoes, others have received new funding from the National Institutes of Health to track the genes and habits of the virus itself. Felipe Dana/AP hide caption

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Emotion seemed to fuel plenty of sighs by Humphrey Bogart's character Rick (right) in the 1942 film classic Casablanca, and even Rick's good friend Sam, played by actor Dooley Wilson, couldn't console him. Archive Photos/Getty Images hide caption

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According to legend, the Explorers Club — a society of scientific adventurers — served its members a prehistoric dish at its annual dinner in 1951. By some accounts, the mystery meat was woolly mammoth; by others, extinct giant sloth. Now DNA analysis has provided a definitive answer — and unraveled a decades-long deception. Katherine Du/NPR hide caption

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When so-called senescent cells were removed from mice, they were healthier and lived longer than mice that still had the cells. Philippe Merle/AFP/Getty Images hide caption

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This San Francisco home collapsed in the 1989 Loma Prieta earthquake, which also claimed dozens of lives. ADAM TEITELBAUM/AFP/Getty Images hide caption

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Alchemist Hennig Brand looks focused, if maybe a bit drained, in this 1795 painting by Joseph Wright. The painting depicts Brand's discovery of the chemical element phosphorus. Joseph Wright of Derby/Wikimedia hide caption

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