Once a year, during a full moon, camel traders and Hindu devotees gather at the edge of this desert for one of the world’s largest camel fairs. The traders tend to their thousands of camels. The pilgrims come to take a dip in Pushkar’s holy lake to purify their souls. So what’s the name of this Indian desert that’s the backdrop for camels and pilgrims coming from far and wide?  Anna Sussman (’05) reports for PRI/BBC’s The World. To listen to the radio piece and to find out the answer to the geo quiz, click here.