Which group first actively experimented with chemicals by applying theory and not just experimental observations ?
As an example , Kuhn suggested that the Sun-centric Copernican " revolution " replaced the Earth-centric views of Ptolemy not because of empirical failures , but because of a new " paradigm " that exerted control over what scientists felt to be the more fruitful way to pursue their goals ( Colyvan 's requirement of " fruitfulness " ) .