Researchers from the Moscow Institute of Physics and Technology have solved a problem that had been considered impossible for nearly a century. They have found a way to arrange 128 tennis balls in a cube, such that each ball touches exactly four others.

The problem was first posed in 1900 by the German mathematician David Hilbert. He offered a prize of 100 marks for anyone who could find a solution. The prize was never claimed, and the problem remained unsolved for over 100 years.

Now, a team of researchers from the Moscow Institute of Physics and Technology has finally solved the problem. They used a computer to search for a solution, and they found one that meets all of the requirements.

The solution is a very complex one, and it is not easy to describe in words. However, the researchers have published a paper in the journal Nature that explains the solution in detail.

The solution to this problem has a number of implications. For example, it could be used to design new materials with improved properties. It could also be used to improve the efficiency of packing objects in containers.

The researchers are very excited about their discovery. They believe that it is a major breakthrough, and they are confident that it will have a significant impact on a number of different fields.