TUNIS (AFP) - UN Secretary General Kofi Annan and a leading US IT expert Nicholas Negroponte unveiled the bright green and yellow working prototype of a 100 dollar laptop aimed at millions of schoolchildren in poor countries. The robust wind-up laptop with low power consumption is meant to be the backbone of an educational project to distribute the Internet-connected computers at no cost to their future owners. "It holds the promise of major advances in economic and social development, but perhaps most important is the true meaning of one laptop per child," Annan told reporters at the World Summit...