Ancient Rome Mystery Solved

[PhysOrg]  In ancient Roman times A.D., Palmyra was the most important point along the trade route linking the east and west, reaching a population of 100 000 inhabitants. But its history has always been shrouded in mystery: What was a city that size doing in the middle of the desert? How could so many people live in such an inhospitable place nearly 2 000 years ago? Where did their food come from? And why would such an important trade route pass directly through the desert?