A curious trend circulating online has left many people puzzled. Videos show residents in Japan placing or dropping small marble balls on their bathroom floors and watching how they move. At first, ...

Which marble run is best? Marble runs are rolling ball sculptures you build yourself. You assemble tracks in all kinds of wild configurations and watch as the marbles roll down hills, around corners ...

The marble ball test is extremely simple. A small glass marble or metal ball is placed on the bathroom floor. Once it is set down, the person watches whether it stays still or starts rolling.If the ...