Harvard University on Monday sent a letter to thousands of alumni, asking them to volunteer to serve as discussion leaders for a new massive open online course based on a class they took at the university, The New York Times reported. The professor who teaches "The Ancient Greek Hero," said he was thrilled with the idea of a MOOC reaching many more students than he could in Cambridge. But Claudia Filos, editor of content and social media for the course, said that there was a need for more help with discussions. She said that, in some MOOCs, discussions "tend to run off the rails." Alumni who volunteer will be screened before taking on duties monitoring and helping to guide discussions.