Speculates why animals have not developed wheels in place of inefficient legs. One study cited suggests three reasons why animals are better off without wheels: wheels are efficient only on hard surfaces, limitation of wheeled motion due to vertical obstructions, and the problem of turning in spaces cluttered with obstacles. (JN)

Examines how categories of race have been historically constructed and applied to science, reviewing research comparing black and white infant motor development from 1931-92; investigating how scientific studies of black motor precocity were influenced by social views on race and racial differences characteristic of the times; and suggesting that…