Research Fellow position; the application link led back here.
...address the mystery of how children learn to speak. We will test the hypothesis that children learn by using their own articulators as a learning device to experiment with different vocal manoeuvres until they sound sufficiently like adults...
Seems to be very interesting to me: I learned one of my L2s at the age of 20 in a similar. I'd think the same is true of my first two L2s as well.