To everyone's surprise, Jack's solutions were correct. The solution manual, it turned out, was hidden in a cleverly designed folder on the university's online server. The folder required a specific password, which was embedded within the index.

From that day on, the students of the physics class looked at their textbooks in a new light. They realized that sometimes, the journey to knowledge is just as important as the destination itself, and that a little creativity and perseverance can go a long way in uncovering the secrets of the universe.

As the class pored over the index, they realized that each chapter had a series of question marks, seemingly indicating that the solutions were hidden within the manual. But how to crack the code?