The way we practice science today is very different from the way it used to be. A lot of what was thought and done 100 years ago, now sounds strange and unacceptable. How do you cope with that past, and how do you try to do better things today? We travel to the Congo, where local biologists and scientists of the Institute work together, and we look at the history of the collections in Brussels. What started off as a small selection of curiosities has turned in to a vast 37-million specimen collection, some of which are highly controversial.