The Experiment of a Doctor

I am not a good storyteller and i don’t have good grammar, I couldn’t find an English version of this story, so I feel that I have to write here;
There is a story that a professor doctor tests his students in a lab with a very big 1 m3 cubic cheese. It has 20 cm thickness of cheese and space inside, in the first stage of the experiment he puts a rat subject inside with students and they close it with 20 cm thickness of lid.
In the second stage, one week later they come back, the professor told them to open the lid and they open the 20 cm thickness lid from that 1 cubic meter of cheese. They see that rat tried to eat walls from many sides and places and bottom and death.
Doctor asks his students “Why this rat death ?”
Some say cuz of darkness, some say because of lack of oxygen, some say it ate much.
The doctor said that none of them are correct. He said “the rat is dead inside because of its instability”, and he adds “if it was able to focus on one point and eat, then he would pass through this 20 cm thickness cheese.”
Nowadays most students have two problems, “instability” & “passion”. We should teach them to focus on their projects & we must encourage them to have a passion for their focus.