That broad definition allows us to include many different missions within the category of mission. Perhaps the easiest way I can explain the difference that I perceive between talking about mission (singular) and missions (plural) is to use analogies from other human activities. We can speak about science (singular), and we have a generic concept in mind. It speaks of the challenge of discovery, experimentation and explanation. It speaks of a method, an ethos, a system of values,
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