At first I really thought he had no shirt but looking closely you can see it is actually a shirt with a black stain/spot on it that looks like a belly button
I rarely post in threads named "Is this guy shirtless at the MacBook hands on?" but if you're going to talk about math then I wouldn't want to miss it!
Who cares??? I certainly don't. The world is so screwed up right now, the last thing I'm worrying about is some guy without a shirt on. I wish life was this simple.....