No one has been able to demonstrate that the location of this mixing point has anything to do with the abundance of smelt.

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It works by forcing fuel directly into the combustion chamber of each cylinder to mix air and gas simultaneously at the point of combustion, rather than mixing air and gas in a separate chamber like more conventional engines.

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"The tea bag water filter technology sounds good especially from the point of it being one step process, with out having to do any mixing, " said Nega Bazezew Legesse of Oxfam.

CNN: Nanotech and 'tea bag' to clean up drinking water