DURING A WEDNESDAY morning jog last April, Oklahoma City clinical psychologist Philip Hyde heard what he thought was a sonic boom. Later that morning, on his way to work, he noticed that every car had its headlights on and the late morning rush hour was reversed, with most traffic heading away from the city. Social worker Pat Murphy had just walked out his door when he heard the boom. His first thought was that there had been a gas explosion. He hurried back into his home, where his wife had already turned on the television, and saw the Alfred P. Murrah Federal Building still smoking and crumbling.
Oklahoma City is used to sonic booms, gas explosions, fierce thunderstorms and …