Under this title there is a very entertaining book about the questions for undergraduate admission at Oxford and Cambridge universities. They are much more than simply reproducing facts and formulas from a manual. They test your combined imagination, logic and knowledge. Not to mention that you have to improvise an answer on the spot. As Pablo Picasso's quote: "Computers are useless,they can only give you answers", the real gem of this book is the collection of those challenging questions, although the author offers also his own sample answers.
The question I liked the most is: how would you describe a man to a Martian?