Crohnology is a health-tracking network for patients with Crohn’s and colitis to share and learn in real-time what treatments, diets and alternative therapies are working for each other. Crohnology was started by Sean Ahrens, a patient with Crohn’s disease – a poorly understood autoimmune condition that causes unpredictable inflammation in the digestive tract. Crohnology seeks to enable patients around the world to take data from their own citizen science (eg. by modifying their gut micro-biome through diet) and collect it in a common place so that the world can learn from the effects of the collective force of individual patient actions.