And one suspect is global warming. Here's a look at what scientists in an underwater lab are doing to uncover the causes. Follow the Bouncing Fishes Fish populations can fluctuate wildly. Some years, the waters are teeming. And other times, the nets come up empty.
Some cool research looks at what roles both nature and humans play.
The Petroglyph National Monument holds more than 15,000 examples of rock art. Albuquerque plans to put a freeway through a slice of it, but plenty of folks think it's a bad idea. Enough to be properly skeptical. And indeed, so-called breakthroughs often fizzle into nothing. A look at how science progresses.