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The article discusses the historical challenges of submarine communications, focusing on early 20th-century attempts to use radio and conductive methods through seawater, noting the limitations of signal penetration.
The article explores the surprisingly enduring legacy of vacuum tube technology, detailing its historical origins and continued use in applications like high-power radio transmitters, microwave ovens, and CRT displays, despite the dominance of semiconductors.
A review of a work exploring the history and cultural significance of spectacles, an early assistive technology.