" But mining is also an intellectual exercise, requiring the combined skills of a plumber, a carpenter, and an electrician as well as an explosives expert. You had to be able to judge the load strength of a beam or the friability of rock at a glance and do instant calculations in your head, because one false step or misplaced stick of dynamite could blow you into body parts or at least send a few digits flying off on their own. So this was the mental procedure, which even a little girl could learn: First, size up the situation. Make sure you have all the facts, and nothing but the facts—no folklore, no conventional wisdom, no lazy assumptions. Then examine the facts for patterns and connections. Make a prediction. See if it works. And if it doesn’t work, start all over again. "

― Barbara Ehrenreich , Living with a Wild God: A Nonbeliever's Search for the Truth about Everything