Lorenz and Karl Popper were childhood friends; many years after they met during the celebration of Popper's 80 years they wrote together a book entitled Die Zukunft ist offen.
Lorenz dhe Karl Popper ishin miq të fëmijërisë; shumë vite pasi u takuan gjatë festimit të 80 viteve të Popper-it, ata shkruan së bashku një libër me titull Die Zukunft ist offen.