Prime Time: There are cataracts, and then there are cataracts
Gooseberry Falls, Victoria Falls and Niagara Falls are cataracts. So is Vernal Falls in Yosemite, where three hikers died recently. The Nile, however, has six major cataracts plus some lesser ones that are not waterfalls, just whitewater places where the river has encountered hard-to-erode rock strata. But there is a third kind of cataract, a medical kind.