The key word in Science is Observation. Making close observations and communicating the results. Use tools to help the observation and mathematics to hone and sharpen the description.

If you want to teach science, start by teaching careful observation. Otherwise, in my opinion, it's not science being taught but awareness of science. Knowing what came before, learning about the observations and science made to build up to what we have today, is important, but should not be mistaken as the central point of being a careful observer.