Emerald Cave, also known as Emerald Cove, shimmers with luminous green light. Here's the best time to visit Emerald Cave and how to get there.

Lake Mead is holding steady, about 7 feet lower than it was last year, but projections released Tuesday show it will have a steep drop in 2027.

It turns out that rivers choose their path based on erosion – a discovery that could transform flood planning and restoration.