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Challenge Question: Don's cornstarch solution is a shear-thickening non-newtonian fluid. What would change if Don used a shear-thinning fluid such as ketchup?
Challenge Answer: The shear-thinning fluid would tend to spread out when disturbed instead of mound up. At the edges of the speaker, the shear thinning liquid would tend to pile up where the oscillations stop and mound up into a ring.
Challenge Winner: Pam Garrett, Los Alamos, MN