Gravity Professor

Tubby said, "e;Why did we roll that ball?"e;The professor's face clouded again with anxiety. "e;To save the world,"e; he said. His voice trembled with emotion. "e;In seven million nine hundred thousand and two years, one month, six days, four hours, thirteen minutes, eight and one-quarter seconds, the world would have been destroyed if we had not moved that ball just where we did."e;