This document discusses various technologies from the 1920s to the 1980s and how they have evolved, including radios, televisions, computers, cameras, tape recorders, calculators, video games, cell phones, and CD-ROMs. It notes that early versions of these technologies were much larger and more primitive than current versions, and some like radios and televisions have seen dramatic improvements in capabilities and sizes over the decades. The document concludes by asking what items the reader used to carry in the past compared to today, where smartphones integrate many of these older technologies.