Students from schools of different levels discovered some of the activities carried out by the research groups working at the Department of Biotechnology and Life Sciences. They learnt how to identify good and bad microorganisms, faced the strange case of the yellow enzyme, and finally, they discovered the world of the infinitely small. Università dell’Insubria – Dipartimento di Biotecnologie e Scienze della Vita; Centro di Ricerca Interuniversitario “The Protein factory” (Politecnico di Milano, Università degli studi dell’Insubria); Consorzio Italbiotec