Yes, there are. But that's because intelligence isn't a single trait, but rather a collection of traits. A person can be really strong in one or more areas, but very weak in another. For instance, a person may have a great ability to learn, but a poor capacity for independent reasoning. These are the people who come across as well educated... and they are... but seem to keep making truly boneheaded life decisions. Then there is the flip side of the coin, people who are great at independently reasoning things out for themselves, but can't seem to learn math or the basics of English no matter how hard you try to instruct them. There are lots of other kinds, as well. Everyone is different, and has different strengths and weakness.