Life, and even humanity as a whole, in some ways have a curious resemblance to cellular structures - that is, there is a 'regenerative tendency' for one thing to get replaced by something that is better.
At the smallest time-scale, when our cells, tissues, neurons, and various structures grow old or when they start to create problems for the body, they will naturally get replaced by other cells, tissues, etc. which are healthier and function be...