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When the technology was founded: In the late 1950's and early '60's.
Why the technology will be around for another 20 years: Though you may not think it, optical media is still one of the most predominant of all storage mediums, besides the hard drive.
The problem the optical disc faces is the rise of non-optical reading equipment in modern technologies, like smartphones and more specifically, many netbooks. Though, this should not deter fans of optical media for the simple fact that so many alternatives are available for say netbook users, such as the download.
But nevertheless, optical media in its simplest form is slim, compact - hence the name, and easy to transport. Sure, it isn't as small or as sleek, or necessarily as to capacity as some flash drives, but they are far cheaper to manufacture and constantly evolving into larger storage mediums. Just compare a 700MB CD-ROM to a 4GB Blu-ray.
When the technology was founded: For the person on the beat, and not in a vehicular setting, around 1973.
Why the technology will be around for another 20 years: Not only are mobile phones a means for communicating via voice from one person to another, but the technology surrounding these 'sacred-in-modern-times' devices has long been a platform to expand existing technology.
Only in our lifetimes, the Generation Y have seen cellphones develop into smartphones; a platform for which technologies are added to and the experience of the device enhanced significantly.
The very notion of cellphones becoming moulded into the human design are all but nonsense. Mobile phones nowadays are beyond 'making a phone call' and more a personal assistant-like device, allowing communications beyond the phone call or text message.
Cellphones may not last another 20 years, but smartphones will.
When the technology was founded: Dial-up internet, predating the dawn of the web. Around the 1950's at the earliest.
Why the technology will be around for another 20 years: The fact that in recent months, dial-up internet access was used in some of the rebelling Arab states, like Tunisia and Egypt, when their governments cut off access to web-based media, shows how important dial-up access is as an ultimate 'backup' solution.
For nations and states who have yet to reach Western modernity, in technology and culture, repressed by their own states, dial-up access is still used across vast areas where broadband and faster internet access is unavailable.
While for many in the Western world, broadband and fiber connectivity may be at the forefront of our minds, still a great number of those in the developing world rely on dial-up connectivity.