A scientist at the university of Bonn displays a flask in Bonn, Germany, Friday, Aug. 19, 2011. The university says researchers have discovered a carcinogenic substance in the flask believed to have belonged to Queen Hatshepsut, who ruled Egypt 3,500 years ago. The scientists spent two years researching the dried-out contents of the flask, which is part of its Egyptian Museum's collection and bears an inscription saying it belonged to Hatshepshut. (AP Photo/dapd, Sascha Schuermann)