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Farmers know that when it's time to train a young bull they yoke together the young one to a mature bull. The mature bull dwarfs the younger bull physically and experientially so the training requires the mature bull to carry most of the weight. Rookies don't pull their own weight either. They are there…

If you fill a bucket with a gallon of water and carry it on your head it quickly grows heavy and tiresome. In contrast, if you swim underwater you have many gallons of water on top of your head and the weight is not really burdensome. The environement that you are in alters your response to the burden.…