This just proves to me how assumptions can be proved wrong by stronger assumptions.
To my mind the world is manifested by making assumptions, all of mathematics is based on assumptions, but there is a hierarchy of assumptions' reach. Those that reach furthest are said to be stronger.
I had assumed that you, IP, were in your seventies, indeed I had even gone as far as to assume that you were an Afro-Cuban facebook friend of mine living in the States.
Here you say you are in your forties, so the assumption is proved wrong.
Science is a combination of making assumptions and checking against reality.
You don't have to check against reality, but reality has a habit of checking against your, primarily because there is always a stronger assumption.
This is evolution in action.