Somalia has long been known as a nation of poets. A people with few possessions and no written language until the 1970s, Somalis developed an oral tradition of poetry and storytelling, that has been passed down through generations. Many of these poems and stories were written down in the late twentieth century. A popular new genre of song on the radio in the late twentieth century was heello, taken from Somali poetry. Some themes of Somali poetry are history, philosophy, and regional politics, as well as praise or ridicule of humans or animals. Probably the best-known Somali poet is spiritual and military leader Muhammad Abdullah Hassan, leader of the Muslim Dervishes. Most Somalis are nomadic herders spend nearly all of their time outdoors. A large shade tree might provide a meeting place or a classroom. In traditional Somali country men and older boys do the important work of tending camels and cattle, the most valuable animals. Girls and young boys tend sheep and goats. Somali men are considered warriors ( waranle ), except for those few who choose the religious life, in todays world become very popular and lucrative . Adult men are also expected to have basic knowledge of the Islamic faith to perform their daily duties. Urban men may work as businessmen, blacksmiths, craftsmen, fishermen, or factory workers. Women in nomadic life are responsible for caring for children, cooking, and moving the family aqal. Women and girls in farming clans are responsible for planting and harvesting crops, caring for children, and cooking. Urban women may hold jobs in shops or offices or may run their own business.The first Somali Exhibition " Somalis-Down-Under" was organised by the SCA here in Melbourne in 2005 and first Somali Bookfair in 2006.