 is change so you don't have time like we know it where time is like moving forward all the time and this little oscillator that is a molecule is you know the atomic clock that tells us when time is moving but time is all relative if you take that atomic clock and raise it a foot off the ground it runs at a different rate because gravity you know it's so sensitive they can tell the difference between the atomic clock right on the ground versus a foot above the ground or a meter above the ground