> Evolution is a scientific fact. Climate change is a scientific fact. This kind of talk can only hurt science. The single most important principle in science

> Evolution is a scientific fact. Climate change is a scientific fact. This kind of talk can only hurt science. The single most important principle in science is that any theory must in principle be falsifiable by new evidence. No falsifiability, no science. Therefore there are no scientific facts, there are only scientific theories, some very good, but all potentially falsifiable by new evidence. If you want unchallengeable facts, ideas cast in concrete, join a religion. http://en.wikipedia.org/wiki/Falsifiability http://en.wikipedia.org/wiki/Falsifiability "The concern with falsifiability gained attention by way of philosopher of science Karl Popper's scientific epistemology 'falsificationism'. Popper stresses the problem of demarcation—distinguishing the scientific from the unscientific—and makes falsifiability the demarcation criterion, such that what is unfalsifiable is classified as unscientific, and the practice of declaring an unfalsifiable theory to be scientifically true is pseudoscience."