Saying that evolution is a theory and not a fact confuses the scientific meaning of these words with their common meaning. It means an overarching explanation that has been well-substantiated by extensive evidence. For example, the heliocentric theory explains that the Earth orbits around the sun, rather than vice versa. Though the idea was very controversial when it was proposed in the 16th century, it now has been proven beyond doubt. Similarly, evolution is a theory supported by so much observational and experimental evidence that the overall concept is no longer actively questioned in science.
Scientists continue to study the details of how evolution occurs.
But there is no debate within the scientific community over whether evolution occurred. The scientific community shares at least part of the responsibility for this situation. In the past, scientists have had little involvement with elementary and secondary education. The release three years ago of the National Science Education Standards, which were produced by teams of scientists and educators, marked a turning point in this long history of disengagement. But scientists must continue increasing their efforts to improve the quality of K-12 education.