Marrying your cousin has long been considered taboo, but new research says that procreating with your cousins may not be as risky as previously thought. Popular Science's Eleanor Cummins breaks down the findings. Eleanor Cummins, Editorial Assistant at Popular Science, breaks down the findings. Columbia University data scientist Yaniv Erlich studied a family tree of 13 million people to see how marrying various relatives impacts the risk of genetic birth defects. He found that one set of first cousins having children doesn't necessarily pose a high risk of having children with birth defects, but if the trend continues beyond one generation, then the risk increases exponentially.

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How America's National Parks Became Critically Crowded With Tourists
Visitation to National Park Service sites has seen a boom in recent years. For five years in a row, the park service has tallied over 300 million visitors per year. It’s an unprecedented spike, and the reason why this is happening now goes deeper than social media alone. While the threat of COVID-19 will likely change those numbers this year, the park service is still figuring out how to regain the balance between preservation and visitation. Cheddar explains the history of crowding in America’s national parks, and the impacts we are seeing from that today.
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