The major advantage of STS is the kind of teaching it allows and demands. Twelve middle school teachers who were enthused with STS teaching selected two sections for a research study. One section was the experimental STS section; the other followed the course syllabus and textbook closely. The major findings indicate the advantages for STS as a teaching approach. Students at the STS approach learned as many science concepts as students who were taught such concepts directly. But the students in the STS sections were superior in all other aspects, including understanding and use of 14 process skills, use of creative thinking skills, development of more positive attitudes, better ability to apply and connect ideas and skills to other situations, and developing a better understanding of the nature and history of science. (Contains 5 tables.)