Gulu is a village of Yi people, located beyond the cliff's edge in Sichuan, China, there is no electricity. The villagers used the lianas and Heaven-Ladders to climb up and down the cliffs like a monkey. They had hardly contact with the outside world until a mule-horse-trail out of the rocks in 2004. The substitute teacher Shen is the only teacher in the Gulu Primary School and has worked over... see more