Is the TV turned off? Not exactly
Article Abstract:
Stereos, cordless phones, mini-vacuums, answering machines, cable boxes, TVs and VCRs can draw power even when switched off. To prevent wasting electricity, appliances can be plugged into a power strip and turned off. A switch can also be installed in outlets or the appliances can be unplugged.
Publication Name: Popular Science
Subject: Science and technology
ISSN: 0161-7370
Year: 1997
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True color arrives
Article Abstract:
Full-color, three-dimensional holograms have been designed by Tung Jeong and Hans Bjelkhagen of Lake Forest College, IL. The process involved hardening emulsions and bleaching which increased the resolution capacity from the usual 3,000 to 10,000 lines per millimeter.
Publication Name: Popular Science
Subject: Science and technology
ISSN: 0161-7370
Year: 1997
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Airships rise again
Article Abstract:
Developments in the design and construction of airships for commercial use are discussed. The details of prototypes, designed to carry either cargo or passengers, and under development by companies in Europe, the US and South Africa, are shown.
Publication Name: Popular Science
Subject: Science and technology
ISSN: 0161-7370
Year: 2001
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