This is all illuminating to me. I knew of Esperanto, and I always considered it a serious attempt at unifying elements of various European languages into one common tongue that would be similar to many and, so, easily learned. I knew Klingon was somehow based on the mechanics of genuine language and not just made-up noises. As for all the rest? I had no idea there were so many serious attempts at creating language de novo. (I almost said, "...creating an artificial language...," but it struck me as redundant.) I'll be googling these things all night.

"I don't know which is worse: ignorance or apathy. And, frankly, I don't care." - Anonymous