As noted by colleague Bill Finley earlier in the week, we've just passed the 50th anniversary of Secretariat's sophomore debut. Yet even two years ago hardly anyone had heard of an unraced son of Tapit, meanwhile acclaimed by many as the best American Thoroughbred since. Okay, so he had been a seven-figure yearling; and everyone who had participated in his education knew that he was something special. In fact, John Sadler was so aware of the impending responsibility that he was saying nothing. For one thing, if people had any...