It happened in the hospital a few years ago.

The great Professor MachinChose systematically tries to instill a great principle in all the students who accompany him for the rounds of patients in his department.

During the tour, the Professor asks a nurse to bring him a urine sample from the patient they have in front of them.

Meanwhile, the professor gives a little speech about diabetes mellitus. He says:

"Already the Romans, in antiquity, had noticed that bees liked the urine of diabetics. Why is that? Because the urine of diabetics contains sugar, glucose ..."

At this point, the nurse returns with a vial of urine and hands it to the professor. The latter grabs the bottle, brings it to the light, looks through it through transparency ... Then he dips a finger in the bottle, and brings it to his mouth! He tastes his finger as if he tasted a good wine ...

The teacher then passes the bottle among his students around him, and naturally, everyone imitates him ...

The professor takes the floor again:

- You have just learned the first principle of a good diagnosis: it is about observation.

All the young doctors are very attentive and await the continuation, which does not fail to arrive:

- You saw that I dipped the MAJOR in urine, but I released my INDEX. And from what it seemed to me, that's not what you did.