Being an American is something I wanted to be for a very long time, probably since I saw the moon landing when I was a child.
One of the most ephemeral and important things is atmosphere and tone and it's very hard to put your finger on what creates that.
For both reasons, owing to the thermal motion and to the working together of various wavelengths, factors arise which, in a similar manner to the structural factor, exert some influence upon the brightness of the interference points but not upon their location.

