SCIENCE. It starts with observation. Information. Data. SOMEBODY NOTICED SOMETHING.
Next somebody (sometimes the SAME somebody) is all "hey, we don't really know how that happens! Do we?"
Soon hypothesises are concocted and offered up, to explain the puzzling phenomenon. These hypothesises are called "hypotheses." Technically. In the plural and all.
SO THEN somebody will be all "WELL HEY! If this hypothesis is true, then we can expect to see this, this, and this as well."
Now that's a testable hypothesis. And sure enough, some mother fucker ends up testing it.
WILL THE RESULTS OF THE EXPERIMENT BEAR OUT THE PREDICTIONS?
Well, shoot dudes. That's what it's all about. We don't know yet.
You've got to do the science first.