This document summarizes 40 years of development in human-computer interaction and graphical user interfaces, culminating in the release of the iPad in 2010. It describes seminal events like Doug Engelbart's "Mother of All Demos" in 1968, which introduced concepts like the computer mouse, windows, hyperlinks, and the GUI. It then discusses the work of Alan Kay and Xerox PARC in the 1970s that built on these ideas and helped launch products like the original Macintosh. The document traces the evolution of portable computing through devices like the iPod and iPhone, leading up to the release of the iPad in 2010, 40 years after Engelbart's pioneering work established many core concepts of modern computing.