I always get a chuckle when some LNT-denier says something like, "we've evolved in a bath of radiation...small doses stimulate the immune system and are good for us". If only I had a nickel for each time.
Yes, the bath of radiation is an environmental stress on our genes that causes genomic instability which promotes evolution.
That "stimulated immune system" is accompanying a reduction in genomic fidelity which leads to cancer. Cancer is just evolution of somatic cells in the body's microenvironment.
Here's a new study which chemicals and yeast were used to test stress effects.
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