Fine quiz:). But 2 things, I got the ozone layer question wrong because there is a typo which changes the meaning of the hint for native English speakers. You put "hold" instead of hole. To find or have a hold on something means a grasp of it. Also, I think Muhammed should be sufficient for the princes name as with all royalty the first name is acceptable. I would have gotten a ten without the typo and if Muhammed was accepted.
Thanks for spotting the typo. I've fixed that to hole.
However, I don't agree on the prince's name. He's internationally known by his first name and patronymic, or by the acronym of that, and I think it's reasonable to ask for one of those in the quiz.
However, I don't agree on the prince's name. He's internationally known by his first name and patronymic, or by the acronym of that, and I think it's reasonable to ask for one of those in the quiz.