Alongside texts, scientific knowledge takes many other forms, including embodied knowledge and “know-how”. However, there are many other ways of circulating information and knowledge: through samples, instruments, compounds, animals, patients and phantoms. This chapter explores the diversity of circulating intermediary objects and the associated processes of preparation, logistics, reception and use, the structuring effects of community and scientific dynamics and their epistemic effects. Field research following intermediary objects reveals otherwise invisible actors and practices. It also makes it possible to study interdisciplinary research practices, including those involving non-academic actors, locally or globally.