A terrorism symposium featuring leading experts will begin with presentation of "tangible proof" al-Qaida not only has developed an arsenal of tactical nuclear weapons but also has begun to deploy them for use in its jihad against the United States and Israel. Paul L. Williams, author of "The Al Connection" and "The Dunces of Doomsday," will present his findings at the National Press Club in Washington at the conclusion of a public debate with Wall Street Journal correspondent Richard Miniter on al-Qaida's nuclear weaponry. The debate, Friday at 10 a.m., will be moderated by Fred Barnes, executive editor of The...