Peter Ward on Earth's mass extinctions

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Shortwave Radio -  Learning The Basics What is a shortwave radio? On the technical side, a shortwave radio is a receiver that can receive radio transmission on frequencies between 3 and 30 MHz. The main characteristic of these frequencies is their ability to "propagate" for long distances, making possible such world-wide communications as international broadcasting and coordination of long-distance shipping. Why would I want/need one? The primary reasons people own and use shortwave radios are personal enjoyment and keeping up with local emergency channels. From a social point of view, shortwave radio is a method of enabling world-wide transmission of information and opinion, and a way to find out information and opinions from around the world. What do I need to know to use one? Shortwave listening is a hobby with thousands of participants worldwide, and all you need to know to begin is how to tune a radio. What types are available? Shortwave radios are distinguished from each other by tuning method, size, and frequency range.