dr. marc siegel and caroline frommel are with us from our medical a team this morning. i want to talk about the potential breakup aspect of that in a moment. doctor, tell us first about the science of this and what is possible. >> well, in this study at johns hopkins, they were looking at mice. and they understand a lot about how these memories get transmitted, these fear memories and how to prevent that transmission from happening. so that fear memory is gone. it's called fear memory erasure. this was just in mice, not in humans. they were successful in decreasing the fear memory. >> dr. siegel, my fear is what we just talked about, that all of a sudden, someone has a bad breakup and wants to erase the memory. now it makes sense in situations like post traumatic stress, you go to war. you have those types of experiences. could we misuse this technology? >> that's very well said, dave. fear memory is very powerful and it can definitely cause you psychiatric problems like ptsd. on the other hand, you can learn