What if your favorite teacher was a robot?

Earlier this year, I witnessed a scene out of science fiction, had it not been reality. A video shown at the NewSchools Venture Fund annual conference showed a young African-American girl answering a teacher's questions with confidence, enthusiastic to get them right. The girl was real, but the teacher was not. She was a virtual instructor named "ALEX," powered by Artificial Intelligence (AI). The virtual being was programmed to use an African-American dialect.