In the "Olden Days", the list of communication vehicles was quite small. Face to face, Parcel Post or Telephone were pretty much the only normal modes of exchanging information. Then in the late 1980's the fax machine started its rise to power as the new "instant" form of 1-way communication, and the information race started.
20 years later we have so many ways to communicate, it's daunting. Land lines, VoIP, Cellular, Twitter, Texting, Facebook, LinkedIn, IM, "snail" mail, E-Mail, Fax, etc. Many of these technologies have huge overlaps so you can email, text, websurf, IM and twitter directly from your cell phones. The computing power in a plain old "Dumb" cellular phone far surpasses the computing power the Apollo 11 Astronauts had at their disposal while the "smart" phones, PDA's, iPhones and Blackberries are just phenomenally-complex and intricate devices that we take for granted.
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