Cripes, I never thought of myself as "a guy in red" .......

In layman's terms (the only ones I use), most of the normal cells are being replaced constantly by your body (they all have a finite lifespan). The idea is that cancer cells do not have the "time clock" for replacement. That is partly why they grow into tumors and masses. Radiation therapy is issued at a rate that will kill the abnormal tumor cells but not damage the normal cells faster than the rate at which they will naturally be replaced. So I should have said "the normal tissues recover and rebuild" as opposed to cells. In actual practice good cells are dying too. Sometimes the dose might be too much for some normal tissues and scarring might be the result. Certainly radiated tissues may not recover completely either. That is why we have so many "new normals" to deal with.

Now about that red thing....do you think we should be a different color?