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

In addition to what the other person has said:

>and how can radiation do damage to us if we are mostly made of water?

Because every little bit of us that isn’t water, which is still a lot, *really* does not appreciate getting hit by ionizing radiation.