“While both water and iron can be measured by a common standard of specific gravity, the floating of iron upon water depends on the shape of the iron, and the shape cannot be given in terms of specific gravity, nor does it alter the specific gravity of either the water or the iron. Yet the shape relationships can keep iron from sinking in water, and the standards of measurement are of another type than those for measuring specific gravity. Science will ever be plagued by those who insist upon understanding that which they do not understand in terms of which they think they do understand.”