Professors Nils Hartler and Ants Teder worked individually on the delignification process of wood by alkaline pulping, work that was later awarded the Marcus Wallenberg Prize in 1993. In celebration of the 20th anniversary of their award, we met the two professors for a conversation at the Royal Institute of Technology in Stockholm where much of the research was conducted. In the clip, they talk about the forest industry from a historical perspective and that today´s challenges have been faced before.