Esperanto

Why Learn Esperanto
https://www.youtube.com/watch?v=8gSAkUOElsg
 * TedTalk: "Learn Esperanto first: Tim Morley, TedXGranta." By learning Esperanto first, one could potentially learn other languages a lot faster, because one can piece together grammatical features, and would help with learning Romance languages faster.

The Language Itself
https://www.youtube.com/watch?v=KztctvSveEI https://www.youtube.com/watch?v=pCiFMD8RNbg
 * LangFocus, "Esperanto - The World's Favorite Constructed Language." History of Esperanto, who currently speaks it, and why it is not as popular as it could be.  Key points: grammar simplicity.
 * Polyglot Conference 2016, "Tim Owen - Had I known Esperanto would be this easy." All grammatical features of Esperanto explained in a 45 minute video with some vocabulary.