Obscure al-Qaida Chemist Worries Experts By CHARLES J. HANLEY, AP Special Correspondent 7 minutes ago He's a mystery in a red beard, with a strange alias and a degree in chemical engineering. In the hands of this alleged al-Qaida operative, it's a specialty that summons visions of poison gas and mass terror. Al-Qaida is "wedded to the spectacular," notes U.S. counterterrorism analyst Donald Van Duyn, and elusive Egyptian chemist Midhat Mursi was said to be exploring such possibilities when last seen, brewing up deadly compounds and gassing dogs in Afghanistan. Van Duyn's FBI and other U.S. agencies are interested enough...