How was Sherlock Holmes' heart made?

Number one: IQ. Detective is a profession that needs brains. Sherlock Holmes is actually the prototype of a professor at Edinburgh University. He manages students with keen observation and amazing reasoning ability at school. I can say it's a personal IQ problem.

Number two: I'm trained. I usually do research and experiments, and make academic reports at school. I have accumulated a lot of knowledge and have keen observation.

I can finally know the intention of the landlord who asked this question. In fact, having keen observation and reasoning ability can be acquired through practice the day after tomorrow. Observe the little things around you and usually do more logical reasoning questions. I recommend a series of books like Mensa series:

Mensa series books are a set of intelligence test books specially published by Mensa Club, an international IQ organization (translated as "Mensa" or "Mansa" in China). They mainly provide logical reasoning, critical thinking, brain teasers, analytical ability, reaction ability, creativity, knowledge level, graphics, questions and answers, crossword puzzles, calculations, puzzles, mazes and so on in the form of puzzles and games. At present, these intelligence test questions are more and more widely used by domestic and foreign business circles for employee recruitment and even professional quality evaluation.

I also have some books by Mensa, which are really useful and interesting. People only know the importance of physical exercise, but they don't know that the brain needs exercise. You can buy it and have a look. They are sold in www.dangdang.com, delivered directly to your door, and there is no freight charge. I often buy books there. Of course, I really need to practice. This is the ultimate goal.