Hercule Poirot, of course (the Belgian, not French detective), is famous for constantly alluding to the use of the 'little gray cells' that people possess. It is an expression that refers to actual brain tissue that is gray in color. For Poirot, he must always use his brain as the best tool for solving a crime.

Poirot is one of the most famous fictional characters of all time. The inimitable private detective is synonymous with waxed mustaches, perfectionism, and strong intelligence. He would be the first to call himself a great man; he has never been known for his modesty. However, with all the great success in his career as a detective, it would be undoubtedly difficult to argue with him.

As Agatha Christie's fictional detective, she felt that she have to state, "Why not make my detective a Belgian?...I could see him as a tidy little man, always arranging things, liking things in pairs, liking things square instead of round. And, he should be brainy – he should have little grey cells of the mind."

For Poirot, his brain is what makes him who he is. Today, he might even call it a fusion-driven supercomputer.

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