Stupid Question for Week of 10/10

I'm back and stupider than ever. Is that a word? No that's not the question. Got some comments from the last question, but no answers or new stupid questions for me to ask/ponder. So keep posting. Make this blog worth my while. Brian I will explain to you what a blog is later... Here's this weeks question...

Why is it called a navel? Do you thing people with "innies" are more introverted than people with "outies"? Does the shape of your navel have anything to do with your sea worthiness?

Well I guess that was 3 stupid questions, but do you have an answer?