dropped the first atomic bomb on high row shima.apan is highlighting the day for calls for a world free of nuclear weapons. about 50,000 attended the ceremony in peace park. the city's mayor says world leaders should learn firsthand about what he calls the evil of nuclear warfare. i'm leland vittert. back to "bulls and bears." >>> president obama addressing the iran cash controversy this week, saying the $400 million given to iran at the same time of hostage release, was not ransom. critics not buying it. and now john says instead of sending plane loads of cash to iran, send sanctions instead. >> yeah. that's right. look, it's hard to put toothpaste back in the tube and once you've opened up the sanctions a lot of companies starting to do business with iran but you have to stop it when we can. it took three and a half decades to get sanctions on iran where they had to come to the table. they came to the table with us, the ones holding a pair of deuces. we're holding a full house and let them dictate the terms. this is one of the wor

what is this i will bring in a dentist, doctor shima, good to see you. >> good to be here. >> she bringse jar. i will put up in front. >> little will something for tooth fairy. >> that is a tooth you extract from an adult yesterday. >> yes. >> did that hurt. >> he was numbed up. >> yes. >> what are you talking about are stem cells. >> stem cells are special cells in the body and they have ability to regenerate and form different types of tissues to turn into skin, bone, cartridge and different types of tissue in the body as needed. >> here's the thing, you have a solution. my mom had it in i don't know what that is call. >> exposed to the air. >> so it doesn't need to be preserved in the special solution. this is a special solution, it is available on amazon and certain drugstores but the tooth need to be preserved within 48 hours of having it removed. >> how long do you have to keep it in the solution, forever. >> you send it out to a stem cell lab and they remove the stem cells from the inside of the tooth and then they preserve it and they freeze it. they have been treating it up to 2