Teachers sing a song at a ceremony to mark the 2012 World Teachers' Day in Nairobi, Kenya, Oct. 5, 2012. Since the World Teachers Day was created by the United Nations Educational, Scientific and Cultural Organization (UNESCO) in 1994, it has been celebrated with an aim to mobilize support for teachers and to ensure that the needs of future generations will continue to be met by teachers. (Xinhua/Zhang Weiyi)

Teachers hold a banner at a ceremony to mark the 2012 World Teachers' Day in Nairobi, Kenya, Oct. 5, 2012. Since the World Teachers Day was created by the United Nations Educational, Scientific and Cultural Organization (UNESCO) in 1994, it has been celebrated with an aim to mobilize support for teachers and to ensure that the needs of future generations will continue to be met by teachers. (Xinhua/Zhang Weiyi)

Kenyan Education Minister Mutula Kilonzo delivers a speech at a ceremony to mark the 2012 World Teachers' Day in Nairobi, Kenya, Oct. 5, 2012. Since the World Teachers Day was created by the United Nations Educational, Scientific and Cultural Organization (UNESCO) in 1994, it has been celebrated with an aim to mobilize support for teachers and to ensure that the needs of future generations will continue to be met by teachers. (Xinhua/Zhang Weiyi)

A Pakistani teacher teaches his class of underprivileged children in a government school in southwest Pakistan's Quetta on Oct.5, 2012, on World Teachers Day. World Teachers' Day held annually on October 5th since 1994, its aim is to mobilize support for teachers and to ensure that the needs of future generations will continue to be met by teachers. (Xinhua /Mohammad)

A Pakistani teacher teaches his class of underprivileged children in a government school in southwest Pakistan's Quetta on Oct.5, 2012, on World Teachers Day. World Teachers' Day held annually on October 5th since 1994, its aim is to mobilize support for teachers and to ensure that the needs of future generations will continue to be met by teachers. (Xinhua /Mohammad)

A Pakistani teacher teaches his class of underprivileged children in a government school in southwest Pakistan's Quetta on Oct.5, 2012, on World Teachers Day. World Teachers' Day held annually on October 5th since 1994, its aim is to mobilize support for teachers and to ensure that the needs of future generations will continue to be met by teachers. (Xinhua /Mohammad)