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1. Why are neutrons more widely used than protons for studying crystal structure? What about using a hydro- gen atom?

2. Why are "cold" neutrons useful for studying crystal structure? How could one obtain "cold" neutrons?

3. It has been said that many experimental discoveries are made as a result of accidents (for example, that of Davisson and Germer). This statement may have some truth, but what traits and abilities must good scientists possess to take advantage of their accidents?

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