A beautiful exhibit where you can explore the viscosity (or stickiness) of three different liquids. Turn over the tubes to see which of the three liquids pours the fastest. What about dropping a marble through each of the liquids - which will reach the bottom first?
If you spin the liquid how does it behave? Does it creep high up the sides of the tube, or stick together at the bottom? When air bubbles are pumped into the liquids, do they rise quickly to the top? What shape do the bubbles make in each of the liquids?