They... did? If you want to make a distinction between Greek natural philosophy and modern science, which understands more about theories, hypotheses, and causality, and is rich enough to support an entire class of professional investigators into the natural world, then sure, the Greeks only had natural philosophy, and Savage is being too broad with his definition of 'science.' I think I side with Savage's approach of normalizing science- I would rather describe science as "deliberate curiosity" than something more rigorous and restrictive.