Albert Einstein called Galileo Galilei “the father of modern physics and in fact of the whole of modern natural science” [Einstein 1933, 164]. He justified his judgement with a rather shocking statement: “pure logical thinking can give us no knowledge whatsoever of the world of experience; all knowledge about reality begins with experience and terminates in it”. Indeed, this is what Galileo is credited to have done. This study aims to show that the experimental confirmation of his conjectural ideas was a constant concern for Galileo from the very beginning of his scientific activity. In order to support my view, I shall quote his early experimental work and first show the extent to which he was able to analyse his results in depth by himself. Then I shall give evidence that he discussed his results with other scientists to help confirm his initial intuitive ideas. He consulted with them and their advice helped him to come to his final conclusion regarding his insight.