A closer look
Newly discovered interstitium is a vast network of fluid-filled spaces connecting connective tissues throughout the human body. This web of microscopic compartments acts as a flexible shock absorber for your internal structures, preventing your organs from tearing when you stretch or bounce. It also functions as a highly efficient superhighway for fluid transport, which unfortunately means it occasionally helps cancer cells spread at terrifying speeds. Your body essentially built a state-of-the-art transit system to keep your insides safe, but forgot to install a security checkpoint to stop the bad guys from buying a ticket
