Isn't that how Science is supposed to work?

Over at CNN.com they've published an article called: Third of study results don't hold up - Wednesday, July 13:

CHICAGO, Illinois (AP) -- New research highlights a frustrating fact about science: What was good for you yesterday frequently will turn out to be not so great tomorrow.

and.....

That means nearly one-third of the original results did not hold up, according to the report in Wednesday's Journal of the American Medical Association.

It would be strange if medical studies always got the same result, because there will always be some differences that can't be controlled, and isn't that how Science is supposed to work?

Explained over at the Talk Origins Archive:
"All scientific statements and concepts are open to re-evaluation as new data is acquired and novel technologies emerge."

Contradicted and Initially Stronger Effects in Highly Cited Clinical Research