As effective and efficient as the above methods are, they are meaningless to the millions of poor and underprivileged in developing nations who day in and day out drink from heavily contaminated water sources.

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So on the face of it, this latest analysis is a vote for conventional methods above organic.

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Apparently, all of the above were considered military-grade, mission-critical methods of communication 100 years ago.

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Current methods used to release the gas from methanol require high temperatures (above 200C) and high pressures, which limits the potential applications.

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