Common Sense?

I have a question. Is there this little drain valve in the human mind that opens up and lets a littles knowledge ooze out when needed. Common sense is a little thing that comes from lifes experiences and a little from instinct. Most people I work with or know have a good deal of common sense. BUT, why is it that some of the smartest people I associate with have little to no common sense. Most of them are highlly educated people such as engineers, chemists and the likes of that. I know one engineer that can do long mathematical equations in his head for crying out loud, put a screwdriver in his hand and he looks like a puppy that can't find his mother. When you educate yourself to higher levels is there a point where you have maximized and have to funnel off a little something (Common Sense Maybe)! PEACE, Jay