The vast majority of  animals involved in biomedical research studies today are rodents, mainly mice. And the scientific information that comes from most of them is questionable because of a source of variability that is often overlooked by the research community - the bedding in their cages. Joining us today to break down the 'what', 'why' and 'what can be done' to protect rigor and reproducibility at the cage level is Joel Shepherd, an expert in rodent bedding manufacturing who has worked closely with the biomedical research community for over thirty years.