John Oliver interviews Stephen Hawking on Parallel Universes, Artificial Intelligence - June 18, 2014

The famed physicist made an appearance on HBO's "Last Week Tonight," and had a deep and meaningful conversation with host John Oliver.

They cover topics such as artificial intelligence, parallel universes, imaginary time.

When Oliver wanted to know about artificial intelligence, Hawking was very reassuring: "Artificial intelligence could be a real danger in the not too distant future."