The autonomic nervous system has two divisions: The sympathetic division acts to energize the body, preparing it for action. The parasympathetic division acts to calm the body, allowing it to rest. Our everyday activities are controlled by the interaction between the sympathetic and parasympathetic nervous systems.
Update: N2Aos is now available for Kindle Fire HD and Kindle Fire HD 8.9. And you get the full Android experience here, including access to the Google Play store and all the other features offered by Android 4.2 (excepting what's not available via hardware, of course).
HTC Desire HD. The HTC Desire HD (codenamed: HTC Ace) is an Android smartphone by HTC Corporation. It was unveiled at a press event in London hosted by HTC on September 15, 2010, and was made available for sale in October in Europe and in January 2011 in Canada.