University students, nicknamed "Squirrel" (L) and "Phoenix", look out the window of a wooden hut built on the trees 8.8 meters (29 ft) above the ground at a nature park in Zhengzhou, Henan province May 1, 2009. The students aim to stay in the wooden hut for a month beginning April 28 and the only contact they have with other people is through the Internet, local media reported. Picture taken May 1, 2009. REUTERS/Donald Chan (CHINA SOCIETY)