leak is going to ultimately be plugged. if the golf balls don't work, if the rubber tires don't work, if this new top hat which the they're trying to lower down into the ocean doesn't work, it will be months before a new drill can reach this pipe and cut it off but that's months from now if none of these interim, temporary emergency measures continue to fail. >> it's -- it's stunning and just incredibly -- incredibly -- well it's incredibly stunning. congressman ed markey i appreciate your time tonight. thank you. >> thank you, sir, thank you for having me on. still ahead, what's behind a wave of gruesome deadly attacks on school kids in china? the attackers armed with knives, even a cleaver. what's being done to stop them. and plus the big "ac360" interview. sebastien younger has a fascinating new book about the war in afghanistan where he found another kind of perfect storm.