In a few weeks, a natural spectacle will take place across much of the United States — one that is not found anywhere else in the world. Billions of cicadas that have spent years patiently growing in complete darkness will finally emerge, perfectly in sync, for a raucous party in the sun.
It's been 17 years, and the periodical insects, also known as Brood X, are back.
When the world last glimpsed the cicadas, Facebook was brand new, theaters were showing "Spider-Man 2," and the 2004 Summer Olympics were underway.
Since then, they've been underground, eating.
"They're in the dark, they're feeding on roots, just living their best lives until the time is right," said Matt Kasson, an associate professor at West Virginia University who studies cicadas and the fungi that zombify them. "And that's when they decide, you know what, it may be time to go up and find a partner."