This document summarizes Mike's discussion on various topics in HCI including the history of user interfaces from 1964 to 2010 and examples of tangible, mobile, wearable, and natural user interfaces. It provides examples of projects for each type of interface including GaussBits for tangible interfaces, iGrasp for mobile interactions, ZoomBoard for wearable technology, and Leap Motion for natural user interfaces. The document advocates thinking differently about how objects can communicate with humans.