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Whenever betting whether X or 'a cheap effective cure for all cancers' will come first, bet on X... Embryo selection or editing for skin color will be even easier than for height or intelligence - easily measured, less polygenic, large cross-racial differences.
Not all cancer, just skin cancer. Actually, some types are already at ~100% survival rate. It's the melanoma one that's difficult. I think we can get this one by better monitoring. Just do regular full body scans. https://en.wikipedia.org/wiki/Melanoma
I.e. step into a booth that does a 3d complete body image. This will allow one to easily detect any changes over time using automatic image analysis. I don't know why we are not already doing this. Tech is ready.
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