Technological progress has always been a series of overlapping S-curves. We all think it’s new when we notice the pattern, but it’s been going on forever. The

Technological progress has always been a series of overlapping S-curves. We all think it’s new when we notice the pattern, but it’s been going on forever. The pace of aviation tech progress in the early half of the 20th century had most believing everyone would be flying hypersonic by now, but then the tech flattened out as it approved its asymptote.