I've thought about this a fair amount and to help myself understand, I've created helpful definitions . I'm almost certain that Websters won't agree but if it was ironclad then we wouldn't be here.
Knowledge - Information gained from experience or learning
Intelligence - A relative measure of how one utilizes Knowledge
Cleverness - Using one's knowledge in an unexpected way to reach desired results

To place these term with the example, we must give the Scientist a motive. For the time being, lets say it was to gain money.
-His idea of building a robot and selling it would be Cleverness
-His ability to build the robot would be considered Knowledgeable
-His giving it to the Dictator would be Intelligence (albeit, Intelligence of a lacking degree)

as a side note- skill would be defined as the ability to use knowledge through a physical conveyance. Essentially the difference between knowing everything about playing tennis and being good at tennis.

Perhaps my definitions are a bit rigid, but by using them I have been able to convey qualities about everyone I have met in a simple manner. Even if some small explanation was necessary it has never taken more than five minutes to convey and guaranty understanding.