There is a factor called "entropy" in physics, indicating that the whole universe of matter is running down, and ultimately will reduce itself to uniform chaos. This follows from the Second Law of Thermodynamics, which seems about as basic and unquestionable to modern scientific minds as any truth can be. At the same time that this is happening on the physical level of existence, something quite different seems to be happening on the biological level: structure and species are becoming more complex, more sophisticated, more organized, with higher degrees of performance and consciousness. This statement, above, was made by Sydney Harris, an evolutionist.