What is more unlikely:

That we could scan someone when they reach their 20s, and get a precise location of each and every atom in their body?

That we would find a way to rebuild someone, atom-by-atom?

That we could rebuild that person when it reaches 40-years old, based on that 20-year old template, and make him immortal?

That we could rebuilt the person brain selectively as to preserve the memories of the 40-year old person.

This is a mechanical pencil, that uses carbon capturing techniques to manufacture is own lead, inside or outside of the pencil.