Decidability, computability, existence, fruit, all have different meanings in an academic context and in a everyday context, and trying to use intuitions from t

Decidability, computability, existence, fruit, all have different meanings in an academic context and in a everyday context, and trying to use intuitions from the everyday meanings in an academic context leads to these "stupid questions". [big number from Wikipedia] "exists" and is "computable" in an academic sense, even though its digits cannot fit in our universe.