Andrew Cockburn, Washington editor of Harper’s magazine, on the rise of high-tech assassins. Celebrated mezzo-soprano Joyce Di Donato with her multi-part Carnegie Hall Perspectives series. Actor/filmmaker Ethan Hawke with Seymour Bernstein, a pianist-turned-teacher, and the subject of Hawke’s new documentary. Trains carrying crude oil continue to ignite and explode. Fracking comes to China.