:smack: I really should have thought of that…
Missy: Yup, I’m always bragging to my friends about my brother the rocket scientist.
Sheldon: You tell people I’m a rocket scientist?
…
Sheldon: I’m a theoretical physicist.
…
Sheldon: My God! Why don’t you just tell them I’m a toll taker at the Golden Gate Bridge? Rocket scientist, how humiliating.
Kiber said:
Actually, I recently heard they purposely sent it underfueled. Apollo 10 was intended as a non-landing dry run, but they didn’t quite trust those astronauts not to say, “Well, we’ve come this far, why not touch down?” In the race to be first and all that. Make sure they don’t have quite enough fuel for that, to preserve the plan.
Wish I had a cite.
Sure, it’s simple on paper. But paradoxically, earthbound stuff is easier mentally.
I’ve always presumed that the “rocket science” remarks have been a reference to an orbiter who is chasing another orbiter. When you’re in orbit, you can’t just go in the direction of the guy you’re chasing, and run the engines on “high”, like you can in a car or plane. (Well, you could if you had unlimited fuel and automated course corrections. But it would be terribly inefficient.)
When you’re in orbit, you have to do the math. Gotta figure out which orbit will bring you to your destination, and change to that orbit. And then coast.
I heard the same thing at the time. “Uncle Walter” Cronkite is my cite. 
And Wikipedia, but which do you trust more?