Works on South Africa refer in some way to its political, economical, geographical, historical or cultural way of life. It is a multi-ethnic nation and has diverse cultures and languages. Eleven official languages are recognised in the constitution. South Africa enjoys a relatively stable mixed economy that draws on its fertile agricultural lands, abundant mineral resources, tourist attractions, and highly evolved intellectual capital. However, it still faces challenges of high crime rates, ethnic tensions, great disparities in housing and educational opportunities, and the AIDS pandemic.