I think those players guess from our expressions...body language and the way we bluff. These kind of skill do not come overnight and i believe that these kind of players would have played a lot.

I only look at my cards one time. Theory being, everytime you peek you give other players an opportunity to read you. Players that peek after the flop comes up all suited, probably have one of the suit, but can't remember which card it is.

I only like to peek at my 2 cards one time, theory being, everytime you peek you give other players an opportunity to read you.

I've always wondered. Why do people wear sunglasses when they play cards? Is it so that people can't read your eyes or something? Or what's the whole philosophy behind it?

Hmm sunglasses is a great idea as the other players would not be able to see what your expression is, unless you are moving the rest of your face so they may be able to tell what your hand may be.