Television is a telecommunication system for broadcasting and receiving moving pictures and sound over a distance. The term has come to refer to all the aspects of television from the television set to the programming and transmission. The word is derived from mixed Latin and Greek roots, meaning "far seeing" (Greek "tele," meaning far, and Latin "visus," meaning seeing).

Origins

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The origins of what would become today's television system can be traced back as far as the discovery of the photoconductivity of the element selenium by Willoughby Smith in 1873, and the invention of a scanning disk by Paul Nipkow in 1884. All practical television systems use the fundamental idea of scanning an image to produce a time series signal representation. That representation is then transmitted to a device to reverse the scanning process. The final device, the television, relies on the human eye to integrate the result into a coherent image.

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Mother Earth News Last 10 Articles

Good Dog!
Mother Earth News Tue, 29 Jan 2008 15:29:17 -0000
Last year’s pet food contamination scare has many people wary of what’s in their best friends’ food. The good news is that there are safe, less-processed alternatives out there for both daily feed and in-between snacks. Here are a few dog treats that are not only tasty, but healthy too. Our panel of canine judges rated each on a scale of one (yummy) to five (delicious!) paws.
Catch the Great Crane Migration
Mother Earth News Wed, 23 Jan 2008 14:37:09 -0000
Each spring, hundreds of thousands of sandhill cranes make a much-needed pit stop on the Platte River in Nebraska as they make their journey north to Alaska and Canada. Anyone can watch this amazing spectacle; here’s how.
Wind Power: Are Vertical Axis Turbines Better?
Mother Earth News Tue, 22 Jan 2008 21:22:44 -0000
Worldwide interest in renewable energy options has given rise to a rash of new wind turbine designs. Some of the most recent models on the market are vertical axis turbines, which manufacturers claim are quiet, efficient, economical and perfect for residential energy production, especially in urban environments. We asked Mick Sagrillo, veteran residential wind power authority, to answer our questions about this technology and its future in the realm of alternative energy.
Antibiotic-resistant Bacteria
Mother Earth News Tue, 22 Jan 2008 20:00:42 -0000
The Johns Hopkins University School of Medicine recently found that supermarket chicken can carry antibiotic-resistant Campylobacter, a germ responsible for more than 2 million cases of diarrhea and 120 deaths in the United States each year. Although most people get better in 10 days or less without antibiotics, a group of antibiotics used to treat Campylobacter and other are essential for treatment of the elderly, pregnant women and those with compromised immune systems. Because these antibiotics were recently routinely used in confined poultry production systems, where disease is a problem, we’re now battling antibiotic-resistant bugs in humans.
Refuges are “Wildly” Successful
Mother Earth News Wed, 23 Jan 2008 14:57:58 -0000
Our national wildlife refuges are more popular than ever as recreational destinations, according to a new report. The U.S. Fish and Wildlife Service estimates that nearly 35 million people visited refuges in 2006, generating almost $1.7 billion. The report also revealed that 27,000 private-sector refuge jobs produced $543 million in employment income.
An Auto Club with Good “Car”ma
Mother Earth News Tue, 22 Jan 2008 20:48:30 -0000
As the eco-friendly alternative to AAA, the Better World Club provides 24/7 roadside assistance in all 50 states. In addition to services similar to AAA, such as assisting drivers with jumpstarts and tire repairs, BWC has a roadside assistance plan for bicycles, and a 15 percent discount on new memberships for owners of hybrid and biodiesel vehicles. Plus, 1 percent of their revenue is donated to environmental cleanup and advocacy.

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