My brother, Shane, is probably the only critical thinker I know.  He's a senior in college majoring in engineering but he's also very good in physics and calculus and science.  He's very smart and spends most of his time studying whether it's at home or at the library.  He has to be well-informed about pretty much everything.  If someone brings up a topic about something and he doesn't know anything about it, he will immediately go on the internet and look it up.  For example, he heard something about scuba diving and since he had never done it before, he went on Google and looked up every little thing he could find out about it.  He also wanted to start rock climbing so he looked up all the information about it and took a class about it before he started actually doing it.  He has to know every single detail about anything before he can actually state his side about it or put his opinion out there.  He's the type that has to over think everything and over analyzes everything.  He has to know every definition and every detail about everything.
       Although he does listen to others' point of views, he still has to be right about everything.  If someone has the same idea as him, he'll go along with it but he still has to be one step ahead of the rest.  If anyone has a question about anything, he'll immediately go and look it up to make sure he has all the information about it before he says anything about it.
      In conclusion, Shane is a big critical thinker.  He thinks about everything and over analyzes everything.  This fact about him, however, is what makes him who he is.