I think you have to split the question into two parts, where one is [literally] computer science and the other is computing technology. There are scads of opti

I think you have to split the question into two parts, where one is [literally] computer science and the other is computing technology. There are scads of options in the second pool, but I think the first is what you're aiming for. No one sticks out, but that's because the actual science & engineering behind applied computing technology is ... esoteric. Additionally, it's hard to find any one thing enough fanatics agree is cool & interesting in order to drive broad popular opinion.