Ionizing electromagnetic waves, usually harmful to most biological beings.

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Hair loss in a submarine?

Biologically, how critical is hair loss on a submarine? What is the prolonged exposure of a navy officer going to do to that person, say over a year or even more?
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Is a single x-ray photon capable of doing enough damage to the dna of a cell to kill that cell?

Ionizing radiation is damaging to DNA, but is there such a thing as a safe dose below which no DNA damage could occur? I'm not asking about a minimum safe dose overall, just whether or not there's an ...
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What are the effects of excessive UV exposure on the human immune system?

In my readings, several authors have suggested that excessive/prolonged exposure to UV (particularly UVA) can have harmful long term effects on the human immune system. This leads to my question, ...