I think I have an extra “Why?” chromosome.
For good or for bad, I was born a skeptic. My mother tells me (true story) that I was expelled from pre-school for repeatedly questioning the teacher. If we did a survey of history’s notable skeptics, I suspect we’d find both heroes and villains. My personal patron saint would have to be Doubting Thomas, who eventually believed, but not without considerable convincing.
Note: Although the above is meant merely as a play on words, many do, in fact, have an extra y chromosome, and it is considered normative in the great majority of case. ADHD (which I have) is often attributed to an extra y chromosome. There are also, however, serious conditions related to extra or missing chromosomes, and I do not in any way mean to belittle the brave souls dealing with such conditions.