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Why yawns are contagious—in all kinds of animals - Last Episode Evolutionary biologist Andrew Gallup explains why we yawn after others Continuation from last episode, Q: Do all animals yawn the same way? A: We’ve done a number of large-scale comparative studies, where we’ve recorded the yawn durations from over 100 mammalian and avian species. We find that even when controlling for body size, there are very strong positive relationships between how long an animal yawns and how large and complex their brain is. Q: One of the most curious things about yawning is that it can be contagious. Do all animals yawn contagiously? A: We’ve been talking about spontaneous yawns up to this point—those are internally, physiologically driven. Contagious yawns are elicited by seeing or hearing yawns in others, and [they] have only been documented in highly social species, humans included. There’s a wide variability in that response among individuals. Some individuals are very susceptib...
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Rewriting the history books: Why the Vikings left Greenland One of the great mysteries of late medieval history itheorthe Norse, who established successful settlements in southern Greenland in 985, abandoned them in the early 15th century. The consensus view has long been that the colder temperatures of the Little Ice Age helped make the colonies unsustainable. However, new research, led by scientists at the University of Massachusetts . It wasn't dropping temperatures that helped drive the Norse from Greenland, but drought. The research was supported by the U.S. National Science Foundation . "The team found no substantial temperature changes, but found a persistent drying period," says Colene Haffke, a program director in NSF's Office of Polar Programs. When the Norse thrived in Greenland in what they called the Eastern Settlement in 985, they made their way by clearing the land of shrubs and planting grass as pasture for their livestock. The populatio...
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