10 Whether or not the idea of progress may someday be dethroned, and perhaps with it our worship of technology, cannot be predicted; progress is not necessarily an established fact of nature, a trend to be carried into the indefinite future. Progress resulting from specific circumstances of the past does not imply progress in the future. Views of the past may rest upon fact; views of the future must rest upon speculation. The idea of progress might die from one or more of several causes. It might die from neglect brought on by the embrace of some alternative idea based upon another view of what is good and what is not; by a deep prevading pessimism or by the imposition of physical, social, intellectual, or spiritual constraints. Technology, upon which belief in indefinite progress has been based, might be capable of indefinite expansion, but progress itself may not. The only thing known to history is change, not necessarily of a progressive nature, and change in itself cannot be separated, as the French historian Taine so long ago said, from place, time, and people. There can be little doubt that technology and science have changed some lives substantially from what they might have been; their use, economically speaking, has proved immensely profitable to some and might prove so to others. But this still does not permit the experience of the United States, or of a few other nations, to be used as an example of what might be wrought elsewhere. Those who