We should note that this latter type of shift was successfully amplified to a considerable extent by Russian physicists using the intense light of a ruby laser whose wavelength is close to that of a transition of the potassium atom.
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“I see my path, but I don't know where it leads. Not knowing where I'm going is what inspires me to travel it.”
“Put three grains of sand inside a vast cathedral, and the cathedral will be more closely packed with sand than space is with stars.”