He used a lot of stupid science as well especially in the early years but there are a hell of a lot of dusck stories where the talking ducks apart everything is far better researched than your average super hero comic. The history and geography often contained a lot of details and the science was not only usually pretty good but on a few cases extrapolated things that latr proved to be true. Barks never let science or history get in the way of a good story but he did try to build his stories on solid ground.
Professor Jack Selegue at the Periodic Table of Comic books has quite a few duck references and they are usually a lot more realistic than the super hero references.
http://www.uky.edu/Projects/Chemcomics/