Ketchup is non-Newtonian (shear thinning) as is corn starch suspension (shear thickening). Non-Newtonian liquids aren't rare. In fact, if we consider pure wate

Ketchup is non-Newtonian (shear thinning) as is corn starch suspension (shear thickening). Non-Newtonian liquids aren't rare. In fact, if we consider pure water to be a Newtonian fluid just about every fluid in nature is non-Newtonian.