[He can't possibly ignore a fellow man of science. Especially when he's clearly doing sciency things that Carlos could potentially help him with! Carlos has his labcoat on too. Granted, it's his formal labcoat, but labcoats are made to do science in!

Excuse me! I can't help but notice that you're doing science! I'm Carlos, and I'm a scientist too. So, if there's anything I could do to help, I'd be more than happy to give you a hand.