the earth being round was quackery, no scientific basis behind it whatsoever, until someone found out that scientific basis and suddenly it wasn't quackery anymore. That is of course unless you are on of these flat earth crack smokers.
That's a myth. Eratosthenes proved the circumference of the earth with amazing accuracy with the tools and geographical knowledge at hand. Regardless, in terms of modern thinking - it is quackery. It however might be feasible with advancements in Nanotechnology to repair the cell damage.
But again, not with our current scientific outlook.