It is time for blueskiers to see this graph on their feed.

Even the sequencing costs are decreasing with time, how come the pipette sets are not __/-•-\__

I have been using Duolingo for a long time. I completed French first (they expanded it a lot since then and I forgot). I also tried Arabic. Later, I checked out German, Indonesian, Hebrew and Korean. The third course I finished was Chinese. I am currently a Japanese learner. It is just for fun.