Finished homework, why the neck acid
Because you write homework when the back of the neck will be bent over a long time will acid
Because the time required to do the work of the hand, and the need to support the neck and the neck of the power, so when done after the trivial operation of the neck acid
Mainly due to the study of stress more time and time of excessive learning and fatigue and other reasons into the current situation of the back of the neck pain
