"People who keep dogs live longer on average than those who do not. This is not some kind of pro-canine campaigning fantasy. It is a simple medical fact that the calming influence of the company of a friendly pet animal reduces blood pressure and therefore the risk of heart attack."

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One of the most striking and fundamental things about probability theory is that it leads to an understanding of the otherwise strange fact that events which are individually capricious and unpredictable can, when treated en masse, lead to very stable average performances.

— Warren Weaver