The U.S. and European markets have become mature, profit margins are lower, and equipment isn't so new. Because profits are relatively low, it limits the willingness of companies to invest in newer equipment.
A voyage to Europe in the summer of 1921 gave me the first opportunity of observing the wonderful blue opalescence of the Mediterranean Sea. It seemed not unlikely that the phenomenon owed its origin to the scattering of sunlight by the molecules of the water.
I don't know what I would have done so many times in my life if I hadn't had my girlfriends.
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