SEATTLE — Have we checked the spare parachute packing card slot? What about the rip cords? Wait, the parachute, was it a 24-foot canopy or a 26-foot canopy? Is there DNA on the tie clip? And, my goodness, how did the money end up at Tena Bar? The questions linger, they spiral, becoming ever more arcane. If you're not versed, if you don't know about the copycats and the diatoms and the titanium particles, it all sounds like Greek. But for those who've been hooked, captivated, enthralled, the legend of D.B. Cooper does not fade. It is a subculture — like Swifties, 12s, the BeyHive — focused arou...