This week’s New York Times Science section has work by two ispotters. Chris Gash illustrates “object agnosia,” a rare disorder in which an individual cannot visually recognize objects, for the Observatory column.

Yvetta Fedorova illustrates the Personal Health column, which describes new study’s ability to show, based on real-life experience, how small changes in eating, exercise and other habits can result in large changes in body weight over the years.