nadr. p. roy vagelos and d. vagelos. the j.p.b. foundation. rosalind p. walter. barbara hope zuckerberg. corporate fu nby mutual of america-- designing customized individual and group retirement products. that's wy we're yo retirement company. additional support has been provided by: and by the corporation for public broadcaing, and by ntributions to your pbs station from viewers like you. thank you. >>> hello. i'm greg sherwood. and here in northern california we're used to emergencies or every kind. in recent years we've dealt wite re drought and massive fires and we've learned the painful but necessary lessons about how to prepare. but we all know another emergency is coming because major earthquakes that can strike at any time are central to our history. we all know another one will hit, and over the next half hour we're going to look at the latest science and explain how you can be proactive androtect yourself and your loved ones. we're going to btalking with our first guest in a few moments, but first we'd like to invite you to support kqed andp take a big