It is not, though. It actually comes from "scientia", Latin for "Knowledge", and the verb "scio", "to know". Observation is how we get and test knowledge in science.
Thus observable evidence is still in the folly! or so I've encountered in various regards ...
I've encountered so many declarations I will not stand on any of them as determinate ... there is just tous much I don't know although folk tell me different ... that nous?