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About 35 million years ago, nimravids roamed all over North America.īut after 12 million years of dominating the continent, nimravids disappeared. And no bobcats, mountain lions or jaguars either.īefore there were cats in North America, there were nimravids, also known as “false” saber-toothed cats (while they had elongated canines, they weren’t actually cats). Why Did Ancient Ferocious Cat-Like Creatures Go Extinct?Ĭan you imagine a world without cats? No furry loafs adorning our sofa arms. Joining guest host John Dankosky to talk about the engineering jargon around bridge infrastructure and new ways of building more resilient structures is Abbie Liel, professor of civil, environmental and architectural engineering at the University of Colorado in Boulder. Moreover, seven percent of the nation’s bridges are considered “structurally deficient.” And the problem could accelerate: Larger vehicles, more traffic, and climate change put a greater strain on bridges that already need regular maintenance. But looking at the numbers, it’s actually surprising there aren’t more failures.Īccording to the American Road and Transportation Builders Association, a third of bridges in America are in need of repairs or replacement. These events are shocking, and cause people to wonder how this could be allowed to happen.
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That is, until infrastructure fails.īridge collapses are especially scary, like the structural failure in Pittsburgh, Pennsylvania last month. If these structures do their jobs well, we don’t think much about them. Our modern world is made up of infrastructure: Roads, buildings, and bridges all play a big role for many people’s daily lives. Pittsburgh’s Bridge Collapse Spotlights America’s Infrastructure Woes