Maybe we can fix the gyro thing ... the gyro has given it's name to another american sandwich that it bears no relation to, although one in short supply in the Philadelphia area ... the Hero.
Okay, so now that you know that a hero is kind of a gyro ... and a distinctive feature of the word gyro is the "Y" ... say it with me ... Yeero. Putting a slight trill on the "R" is okay, but not necessary.
And now the big secret ... if you, as a non-Greek American, starts saying it right, the guys in the restaurant will NEVER UNDERSTAND YOU.
They expect everyone to say it wrong and are taken aback when the word accidently slips from someone's mouth.
Stick with the Chicken Souvlaki Sandwich.
My areas of ignorance are vast. I enjoy a large number of spectator sports, but there are bits of the rules that remain a complete mystery to me. For example, I know that you can be penalized for offsides in Football, but I have no clue what that means, even though I get it in hockey or soccer. I can watch football and become excited about action on the screen, largely because I know it is action. I can sometimes even correctly identify the foul that was called, without understanding the mechanisms of the foul itself.
I have always lived in apartments so things like basic plumbing mystify me.
I cannot do math advanced beyond Trigonometry. I had an extreme, possibly unreasonable, fear of Calculus. Because of this fear I did not major in Computer Science in college. This is probably a good thing, because all of my programmer friends who really liked calculus are unemployed now.
I also do not understand the stock market.
I also am mystified by electricity, including the answer to the question "Why doesn't it leak out of the wall through an open plug."