But much disease is acquired environmentally, and many repairs are due to normal wear and tear, building anew would be useless to serve both of those ends. And

But much disease is acquired environmentally, and many repairs are due to normal wear and tear, building anew would be useless to serve both of those ends. And unless you can figure out why cells age, you can't build new humans who are immune to senescence either. Defeating the aging process is critical to solving both problems.