That Henry Kissinger is still alive will come as news to some people. He's hard of hearing, blind in one eye, and has had multiple heart surgeries. Yet, he says, he works about 15 hours a day. And – incredibly – he remains relevant on a global scale. Koppel asked, "If you had one of your aides here pick up the phone and call Beijing and say, 'Dr. Kissinger would like to speak with President Xi,' would he take your call?" "There's a good chance that he'd take my call, yes," he replied. And Russian President Vladimir Putin? "Probably, yes."...