Why is the Danish language proving difficult for children to learn? Morten H. Christiansen discusses difficulties in understanding Danish.

Academic review paper about Danish: https://onlinelibrary.wiley.com/doi/10.1111/lang.12450
UK version of The Language Game: https://www.penguin.co.uk/books/1119740/the-language-game/9781787633483.html
US version of The Language Game: https://www.basicbooks.com/titles/morten-h-christiansen/the-language-game/9781541674981/

Image courtesy of interviewee