On the Road Again: Metal Foams Find Favor

Abstract

The three states of matter are well represented by earth, sea, and sky. God saw that it was good, and so did many generations of physics lecturers. But purity is obscurity, as Ogden Nash reminded us. The rich variety of combinations of gas, liquid, and solid that are found in nature's creations and mankind's artifacts presents us with an infinity, rather than a trinity, of possibilities.