Langua Demo: An AI program you can practice conversational language learning with.

I was skeptical at first, but AI is advancing fast.  There are so many options and features, and it's incredibly accurate.  And it's likey to only improve over time. 

It can help you practice listening, speaking, reading... the demo really starts about 2 or three minutes in.

Uncovering Star Trek's Lost Series: Phase 2

Wow.  This explains a lot.