back with my experts answering your tweet questions. first we will start with is mary. i have a question from -- i don't have it here. it is from robert. i got it earlier. robert said what happened to houston the guy headed up the mh-370 search? we haven't heard from him in a long time. >> that's right. they said he would report back when he said he had something to report. sadly i think he has had nothing to report. >> les, this is from jason. he says why would a pilot do a 170-degree turn unless the plane was in trouble. if the pilot lost his avionics what would he do? >> that's my whole mechanical scenario i have been leaning toward is that he did a diversion their tactic heading to an airport he was familiar with because of some sort of mechanical problem. if he lost his avionics he has