You didn't have to be a rocket scientist to figure those things out.

All of the rocket scientists working on the project were German.

It didn't take a rocket scientist to figure out what had happened.

Did we all have to be, to use the traditional expression, rocket scientists?

You have to be a rocket scientist to figure it out.

She didn't have to be a rocket scientist to guess what it was.

You don't need to be a rocket scientist to figure that out.

You didn't have to be a rocket scientist to figure that one out.

I don't have to be a rocket scientist to figure that one out.

It didn't take a rocket scientist to figure out what was inside.

It didn't take a mental giant to notice that people were rearranging themselves in line to get out of my way.

I am a child striving to cope with a mental giant.

With the development of a scientific age, man suddenly had been called upon to become a mental giant.

Occasionally a mental giant will be born, but not often.

Do not stop till you find one of these mental giants.

He would take that mental giant into the future, in search of a suitable mate.

That doesn't take a mental giant to figure out.

Snake Butarindala had never been a mental giant, he thought.

I guess they are "mental giants" too, so you have a point there.

But if he's such a mental giant, why isn't he getting results with his own problem, the meteor?