eli5 how does water stop radiation and not everything else outright, and how can radiation do damage to us if we are mostly made of water?

Question

eli5 how does water stop radiation and not everything else outright, and how can radiation do damage to us if we are mostly made of water?

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Answer 1

Water is made up of molecules that are made of hydrogen and oxygen atoms. The hydrogen atoms have a positive charge and the oxygen atoms have a negative charge. This makes water molecules attracted to each other. When radiation comes into contact with water, the water molecules start to vibrate. This process continues until the radiation is gone. The water molecules absorb the radiation and then release it as heat.