Very, very rare. Uranium used in power plants is typically only 3% U-235 (the explosive stuff), while bomb-grade uranium is nearly pure U-235. Simply, the concentration of U-235 in reactor-grade uranium is too small to start a chain reaction and detonate like a bomb.
Comparative and experimental investigations are two of three scientific investigations, the other is descriptive investigations.
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Look I would help but I'm not learning that stuff yet in Middle School.
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