1st idea: Engineering
-What do you think makes an engineer?
-Where do you think engineers go after college?
-How do engineers become what they are today?
2nd Idea: Video Games
-What do you think is the best video game of all time?
-When did you start playing video games?
-Who do you think makes better games: Nintendo, Microsoft, or Sony?
To be honest, I’m more interested in the video game topic. This is because there are more opinions to be said on video games. Engineering is a bit more complicated because not many people are into engineering however almost everyone in the world knows what video games are and at least has played one.
I agree — I can feel your passion for video games. A good TEDTalk could absolutely be made about any number of topics within that larger topic. Of course, “better” is really subjective, but you could make a fun talk that’s a combination of objective points (like resolution, story types, etc) and person opinion (yours plus other people’s).