Inductive reasoning
 Induction is the method of science. A scientist makes a large number of observations, and then suggests a general rule that all of these observations follow. He then publishes his ideas, and they are checked in many other cases by other scientists. The general rule becomes a scientific theory only if it passes all of these tests. If it fails even one test, then the theory must be either changed or thrown out. The major scientific theories of today have been tested many thousands of times and have passed every test.