some of these are pretty cool. . SYNOVIAL FLUID THE FLUID THAT EASES JOINT MOVEMENT IS THE MOST SLIPPERY SUBSTANCE KNOWN Til MAN. WHEN YOU BLUSH THE LINING OF Y some of these are pretty cool SYNOVIAL FLUID THE THAT EASES JOINT MOVEMENT IS MOST SLIPPERY SUBSTANCE KNOWN Til MAN WHEN YOU BLUSH LINING OF Y