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A bridge and road submerged by floodwaters from the North Fork of the Kentucky River in Jackson, Kentucky, July 28, 2022. Leandro Lozada/AFP via Getty Images

What is a flash flood? A civil engineer explains

As recent deluges in St. Louis and Kentucky show, flash flooding can happen in urban and rural areas, with deadly results in either setting.
Crowds gather at dusk in Austin, Texas, to watch some 1.5 million Mexican free-tailed bats emerge to feed from their roost under the Congress Avenue Bridge. Jeff Haynes/AFP via Getty Images

Artificial intelligence can help highway departments find bats roosting under bridges

Bats roost under bridges and culverts across North America, so highway departments have to check for them before repairing bridges. A new AI tool makes those inspections faster and more accurate.

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