Difficulty Levels

I've been looking for hours, and I can't find an answer to the following:

What, exactly, are the bonuses / penalties for going up in difficulty level?

Also, is there any way to see a score? The closest I can get is the ranking compared to the various historical leaders, but I'm not seeing any numbers to go along with it... what determines how high you score?

Thanks -

Chieftan - You get +100% attack and the AI is extra stupid.
Warlord - You get +50% attack and the AI is still quite stupid.
King - No bonus, normal AI stupidity.
Emperor - AI gets 20% handicap (all production costs are reduced by 20%).
Deity - AI gets 40% handicap.

At King and higher the AI has the same "intelligence" it just gets a production bonus above King. If you play online, the AI is the same as the King AI.

The score thing is kind of weird. You never see your score normally, but if you play online, your highest score will be recorded. You won't know if you beat that score until you go and check the leaderboard again. It doesn't really mean much. The amount of points gained or lost for a game seem dependant on the relative rankings of the players in the game, not how many points are earned.