proof
There is no such thing as proof. Proof is a mathematical concept. It does not apply to real life.
even I have to believe what these sources say.
That's not true. You don't have to believe anything.
I feel confused about whom to believe.
Why place your faith in others? Why not make your own decisions?
In science, we do have things which we have proof for a number of things
Why do you believe that?

