"As the tunnel came closer, they saw, at the edge of the sky far to the south, in a void of space and rock, a spot of living fire twisting in the wind. They did not know what it was and did not care to learn. It is said that catastrophes are a matter of pure chance, and there were those who would have said that the passengers of the Comet were not guilty or responsible for the thing that happened to them. The man in Bedroom A, Car No. 1, was a professor of sociology who taught that individual...