Alvin, our software engineer and cofounder, has built these tools.

So to understand this, let's look at one of those classes, the Machine Learning class offered by my colleague and cofounder Andrew Ng.

This high school dropout died at the age of 82, a formidable intellectual, cofounder and first CEO of the Hebrew University of Jerusalem, and founder of Schocken Books, an acclaimed imprint that was later acquired by Random House.