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Atoms by itself are not good or bad. The human body has evolved over hundreds of millions of years to be able to survive in a certain environment. So, a system has evolved that can make the best out the environment it lives in. Certain compounds or elements that we can make or extract from the environment can be quite alien to our biology, they can interfere ...


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Everyone is likely to have a similar pain threshold to electric shocks. If your friend wears leather soled shoes he will conduct static electricity to earth because they offer much less resistance to earth than rubber or plastic soled shoes. Wearing synthetic clothes may cause a similar effect. If he/she has lower resistance than you (by having sweaty ...


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As far as I understand it, the curves indicate the fraction of energy released at each point by each type of (ionising I suppose) particle thrown at the material. It can be interpreted as the percentage of energy lost in the neighbourhood of a point $M$ located at depth $d$ in the material. If you were to integrate the curve over the whole depth, you would ...



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