As in their mind-expanding, gorgeously photographed and provocative Material World, Peter Menzel and Faith D'Aluisio once again present diverse families around the world, this time focusing on what people eat. The photographs themselves (of 30 families in 24 countries with a week's worth of groceries arrayed around them) are fascinating -- and the accompanying sidebars and statistics on food habits, diet, and economics are just as riveting. With essays by Michael Pollan, Alfred Crosby, Carl Safina and others.  (WLD65, $40.00)