The idea of the experiment arised after I got an advice from our Chief Physicist of Summer School. An advice was to let fast students solve their own list of problems ahead of other children - an obvious advice, but not for me. And then I thought: ok, I need two threads of execution, but why execute them on the same CPU? It's 21st century now, the era of multi-core processors! And here we come to the idea of the experiment: two threads, two teachers!