Our Own DevicesBy: Edward Tenner This delightful and instructive history of invention shows why National Public Radio dubbed Tenner the philosopher of everyday technology. Looking at how our inventions have impacted our world in ways we never intended or imagined, he shows that the things we create have a tendency to bounce back and change us. The reclining chair, originally designed for brief, healthful relaxation, has become the very symbol of obesity. The helmet,