Why are many people afraid of extraordinarily intelligent individuals? Any psychologists here?

I have often heard this in lots of my classes but have absolutely no clue why somebody might be scared of a person smarter than them, since they neither can be totally sure of that nor is there an actual reason to feel intimidated by them. They're just people after all. However, after having done some research online, I found out being very smart makes you different and hence most will not be able to relate to you anymore because such a persons' conduct tends to be more influenced by reason than by simple emotions. As human beings naturally fear the unknown to protect themselves from dangers, this common assumption really might be true. For instance, the bright kids often get picked on at school and are excluded from the rest - although these do not resemble the stereotypical nerds in any way !

So what's up with this theory?
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Here is an example.

www.fluther.com/.../
Why are many people afraid of extraordinarily intelligent individuals? Any psychologists here?
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