MIT OpenCourseWare materials that are most useful for high school students and teachers.

MIT OpenCourseWare (Massachusetts Institute of Technology) has over 1800 online courses to be viewed and freely participate in.

There is now a resource area called MIT OpenCourseWare: Highlights for High Schools that helps to support science, technology, engineering and math instruction at the high
school level.

One example is a guitar building project where students learn about the "physics principles by examining the physics responsible for producing music with electronic stringed instruments, while building, testing, and playing their own electric guitar. Students will design their own Guitar bodies, construct their own pick-ups, assemble their own guitars, tune them using a chromatic tuner, and use them to play a simple song."