Yep, and they're making their way into wrist and pocket watches too. http://www.hoptroff.com/collections/atomic-timepieces http://www.hoptroff.com/collections/

Yep, and they're making their way into wrist and pocket watches too. http://www.hoptroff.com/collections/atomic-timepieces http://www.hoptroff.com/collections/atomic-timepieces https://www.kickstarter.com/projects/846511652/the-worlds-first-true-atomic-wristwatch-the-cesium https://www.kickstarter.com/projects/846511652/the-worlds-fi...