I'm a native English speaker who learned Spanish, and some Russian & Esperanto.<p>I'm thinking about Esperanto. Perhaps most relevant to this discussion is its benefit of being by far the cheapest workable global route to everyone being able to talk to and understand each other, even if haltingly. For some people, learning English is simply too hard. For the rest, it's still a very big effort, and Esperanto is extremely easy by comparison. In terms of global cost/benefit, Esperanto seems like a big win. (And it's fun.)<p>Further, I have started thinking that Esperanto should be everyone's 2nd language, simply because it's so easy to learn yet seems ~"complete", and more importantly, has been shown to make learning other languages easier to the point that overall you learn, say, more French (or probably English) if you learn Esperanto first, than if one spent the entire time studying French. So learn whatever you would have learned as a 2nd language, for the 3rd, and you saved time and got farther, overall (<a href="https://en.wikipedia.org/wiki/Esperanto#Third-language_acquisition" rel="nofollow">https://en.wikipedia.org/wiki/Esperanto#Third-language_acqui...</a> [wikipedia.org]). And it seems to me the easiest way for someone to better understand the grammar of their own native language, by seeing a simple & clean example. (Some in one forum I saw dismissed the studies, but when I read the dismissals it seemed a case of believing what you want, with the studies being more persuasive to me as they put much more work into it, but I would be interested in more info.)<p>(I don't think most users see it as a replacement for a first (or native) language, though that has been done intentionally by some (per <a href="https://en.wikipedia.org/wiki/Native_Esperanto_speakers" rel="nofollow">https://en.wikipedia.org/wiki/Native_Esperanto_speakers</a> [wikipedia.org], or search <a href="https://en.wikipedia.org/wiki/Esperanto" rel="nofollow">https://en.wikipedia.org/wiki/Esperanto</a>
for "native").<p>(There are other interesting constructed languages each with their pros & cons, but none with nearly the same amount of traction or interest as Esperanto. It's interesting to consider, given all that has been learned in the field so far, how to "optimize" a constructed human language, considering various factors like ease, familiarity, beauty, efficiency, computability, or whatever one sees as most important. ... )<p>Claude Piron made an interesting/enjoyable video, I think in different languages, showing some benefits of Esperanto. Here is the one in English:<p><a href="https://www.youtube.com/watch?v=_YHALnLV9XU" rel="nofollow">https://www.youtube.com/watch?v=_YHALnLV9XU</a><p>(edit/ps: I hope to use Esperanto when my personal organizer gets the ability to use multiple languages for the same "knowledge". AGPL: <a href="http://onemodel.org" rel="nofollow">http://onemodel.org</a> .)
(pps: had i noticed the "more" button I would have realized others in the discussion already wrote about this.)