From an engineering perspective, the human throat is a terrible design. Food and air have to pass through the same crowded passage. Fortunately, that passage is separated by a flap, but it has to move at exactly the right moment, every single time.…
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fossil records
“My research tracks the long-term migration and seasonal behaviors of large animals, like wildebeest and zebras, in Kenya,” O’Brien continued. “By studying the chemistry of fossil teeth, I demonstrate that animals behaved quite differently in the Last Ice Age than they do today.”…
