Byju's, an Indian ed-tech start-up, recently received $50 million in funding from the Chan Zuckerberg Initiative or CZI, named after Facebook founder Mark Zuckerberg and his wife Priscilla Chan. Byju's founder Byju Raveendran, who describes himself as "an engineer by chance and teacher by choice" in an exclusive interview, reveals how he convinced Zuckerberg to invest in Byju's - CZI's first Asia investment.