Professor, author and string-theorist-about-town Brian Greene wants to expand the ways we learn about science. Greene, the author of popular physics books such as The Elegant Universe and the host of several science specials on PBS, recently led the creation of a free online learning hub called World Science U.

The site offers video courses on topics such as special relativity and quantum mechanics. It is a spin-off of the World Science Festival, an annual event run by a nonprofit organization Greene founded in New York.

Greene says he’s been thinking about digital education since the 1990s, when he moved from Cornell University to Columbia University but wanted to continue teaching his former students.

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