the search for flight 370 said it detected a pulse signal in the indian ocean. there's no confirmation. joining me now harvard law professor, author of "taking the stand, my life and the law." you wrote this memoir, 50 years at harvard. you're now retiring. off all things there's a story in this book of you being aboard a plane expected to crash. >> 41 years old. i had just taken my oldest son to college in colorado. we get 10, 11,000 feet in the air and the pilot comes on and says we have a serious, serious problem. who knows how to do disaster control. told us we would have to have a dangerous landing. asked for volunteers. i changed my seat and sat next to a pregnant woman to help her out. i wrote notes to all of my children. put it all in my whole little black box, my shaving kit, hoping it would survive.