"I don't really have any regrets because if I choose not to do something there is usually a very good reason. Once I've made the decision I don't view it as a missed opportunity, just a different path."

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Scientists, therefore, are responsible for their research, not only intellectually but also morally. This responsibility has become an important issue in many of today's sciences, but especially so in physics, in which the results of quantum mechanics and relativity theory have opened up two very different paths for physicists to pursue. They may lead us - to put it in extreme terms - to the Buddha or to the Bomb, and it is up to each of us to decide which path to take.

— Fritjof Capra