Intensive care medicine is full of unanswered questions, controversies and subtle variations in practice. 'What's the evidence Tuesdays' aims to provide a brief 10-minute oral overview of the rationale and evidence behind an investigation, intervention or approach to management. Whilst based on the fellowship 'critically evaluate' style exam questions it is an MDT forum designed to encourage all clinical staff to know and keep up-to-date with the evidence (or at times lack of!) that guides our day-to-day decisions and where applicable understand why debate amongst the critical care community may still exist. Each week a two-sided written summary of the session is created for those who were unable to attend. Similarly, this summary provides a written resource for fellowship exam candidates to refer to with the understanding these are not model exam answers.