That weekend, his grandfather’s old greenhouse was failing. The seedling trays were freezing because the small electric heater couldn't keep up. While his dad suggested buying a second heater, Maxim grabbed his "Isachenkova" and a calculator.

Suddenly, the book felt heavier. He realized that the "Sbornik" wasn't just for passing exams. It was a toolkit.

The year was 2024, and for Maxim, the blue-and-white cover of the physics problem set wasn't just a book—it was a challenge. To most eighth-graders, it was a collection of diagrams and numbers, but to Maxim, it was a manual for how the world worked.

His dad was skeptical but helped him set it up. That night, the temperature outside plummeted, but the "Isachenkova Method" worked. The water barrels radiated just enough warmth to keep the seedlings from frosting over.

"Wait," Maxim said, flipping to the section on .