The FAST system is the first step in an effort to use Xerox PARC's expertise in physics, engineering and computer science to invent and commercialize new technologies for biology and health care.

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The courses span a spectrum of topics: physics, biology, computer science, engineering, medicine, literature, sociology, poetry, business and many more.

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Udacity offers 11 STEM courses like "Introduction to Physics, " "Intro to Computer Science, " and "Web Application Engineering" -- all free.

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