The document discusses various methods of communication over the past 200 years, including the telegraph (1837), Pony Express (1860), telephone (1876), microphone (1876), mobile phone (1982), and the World Wide Web (1990). It provides a brief overview of when each method was introduced and by whom. The conclusion is written by Kevin Wu, Rhys Mcbreen, and Justin Yau, and bibliographic references are provided for each section.