Shun all vice, especially card playing.
In order to make further progress, particularly in the field of cosmic rays, it will be necessary to apply all our resources and apparatus simultaneously and side-by-side; an effort which has not yet been made, or at least, only to a limited extent.
Etiquette is all human social behavior. If you're a hermit on a mountain, you don't have to worry about etiquette; if somebody comes up the mountain, then you've got a problem. It matters because we want to live in reasonably harmonious communities.
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