The Hittite Empire emerged around 1650 BC in semi-arid central Anatolia, a region that includes much of modern Turkey. For the next five centuries, the Hittites were one of the major powers of the ancient world, but around 1200 BC, the capital at Hattusa was abandoned and the empire was no more. ... Manning and Sparks combined their labs to scrutinize samples from the Midas Mound Tumulus at Gordion, a human-made 53-meter-tall structure located west of Ankara, Turkey. ... But equally important are the juniper trees -- which grow slowly and live for centuries, even a millennium -- that were...