
The second is the duration of 9 192 631 770 periods of the radiation corresponding to the transition between the two hyperfine levels of the ground state of the cesium 133 atom. But is it always so instant? How long is o…
ohh
Really Really Awesome track!! So honored to connect with you…
😵 I LOVE THIS!!! 😩💦💦
What type of piano is this?
