In rusting iron is present in the form of fe +2 or fe+3

Rust is Fe2O3 or iron (III) oxide. Therefore iron is in the form of Fe3+

Yes you are correct use the scientific method

Ithink that the use of creativity in the sciences entails that one produce something out of nothing or from another thing. with this, i think that the he wrote down his results as four parts of the atomic theory is the manifestation of the  creativity of john dalton.