Galileo wrote the following in his 1615 letter to the Grand Duchess Christina: "But I do not feel obliged to believe that that same God who has endowed us with senses, reason, and intellect has intended to forgo their use and by some other means to give us knowledge which we can attain by them." Galileo was convinced the sun was near the center of the universe. Other people (ahem, the Catholic Church), not so much. As we are still fully aware of today, it can be pretty rough to get people onboard with new scientific knowledge -- and to get them to give up what they've always known.

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