Actually this is not entirely true.
Reason alone has nothing to do with it actually, for if reason was truly the guide, then scientific beliefs would not have been shown over time to be wrong in so many cases.
Science is essentially about having some idea, then having a way to test to see if that idea is true or false.
Problem is, that the truth of falsity of these ideas are generally a relative proposition in science, as it was scientific to hold that the sun revolved around the earth, based on observation and reason.
This is why some new idea can completely change what is scientific truth...
Not until instrumentation allowed for a better point of view, was it really known that the sun does not revolved around the earth.
It was actually scientific to observe the sun moving in the sky around the earth, and since everyone saw the same thing, and since it happened all the time...that was a scientific conclusion.
Observation+what was considered by the masses to be reasonable.
Science is not always the best thing going, and science is limited to the 5 physical senses and completely ignores much of that which is not known via the physical senses.
Science as it appears today is so far removed from the purity of science in the past, that it has become a religion for many.
Much of the foundation of science is a speculation, or a foundation of ignorance.
For instance, if a scientist can't see a pattern, does that logically mean that there is no pattern?
If a scientist doesn't see a cause, does that mean things are causeless?
It is silly actually...but there is little doubt among the reasonable that even atheists need something to believe in, even if there is no real proof of what they believe.
People who actually believe, as if it were a fact, that man came from apes, or that there was some big bang...
Well, science has grown into a mythology satisfying even Joseph Campbell's ideas that every society needs some mythology...even if that mythology is the dreams of a big bang, or human's from monkeys, or water droplets being designers, etc.
Quote from vhehn:
The scientific method is merely a formal methodology concerning how to apply reason.