YOUR BONES HANG OUT IN A LOT OF JOINTS. KNEE JOINTS. HIP JOINTS. THE JOINTS IN YOUR FINGERS AND THE JOINTS IN YOUR TOES. WHEREVER BONES MEET, THERE IS ALSO CARTILAGE, A RUBBERY, PROTECTIVE LAYER THAT ENSURES YOUR JOINTS BEND SMOOTHLY AND PAINLESSLY. BUT EVEN CARTILAGE CANNOT DO THIS TREMENDOUS JOB ALONE. A THIN MEMBRANE CALLED THE “SYNOVIUM” PROVIDES FLUID …
