 But keeping track of these minute, I mean, we're talking milliseconds here, right? A millisecond less than a sneeze, whatever it might be. But that really matters for the precision that you need for GPS navigation systems. Anything pretty much from here that you're sending into space or to another planet. Great story you can find online at WashingtonPost.com from Kasia Patel about the slowing of our Earth's rotation. Online at WashingtonPost.com.