Professor John Tyler Bonner has spent a lifetime researching the slime molds and created a number of fascinating films in the 1940s to show the life cycle; he has mostly studied D. discoideum. In the videos, intelligence appears to be observed as the single cells, after separation, regroup into a cellular mass. The time-lapse film captivated audiences; indeed, Bonner when giving conferences has stated that the film "always stole the show".[8] The video is available on YouTube.[9]