1、It´s been a very long time since the human being has to rap the sticks together or find other way to hitting up wood in order to start fire. Traditionally the Li people living the remote mountain of Hainan Island. They pick the piece of wood to get fire, but even they use the ancient technique many decades ago however in the interest attracting tourist in culture. 2、The urban lighting and remolding projects will cause ecological damage and scare away the swifts in the Summer Palace. After test people found there should´t be any lights near swifts´ nests.