When you die, your biological story transitions into a bustling ecosystem known as the necrobiome. While many assume decomposition is driven by external factors, the process begins with the trillions of microbes already living inside you. During life, your immune system keeps gut bacteria in check, but upon death, they turn on their host. As cells lose oxygen and undergo autolysis—essentially digesting themselves—microbes feed on the resulting nutrients.⁠ ⁠ Multiplying and spreading through your organs, these anaerobic bacteria switch to fermentation, producing the gases and chemical signatures of decay. This internal takeover is the first step in a biological recycling program where your own cells become fuel for a thriving world of microorganisms that persist long after your heart stops. This "thanatomicrobiome" ensures that your body remains a vital source of life for the microscopic residents that once helped you survive.⁠ ⁠ _____⁠ ⁠ This process is not a grim finale but a vital ec...