dr. zack researches oxytocin which helps people cooperate. >> we wondered about the role of trust.r body? >> it functions to cause us to reciprocate almost always. it's the biological basis for the golden rule. >> by hugging people people release more of this hormone? >> oxytocin. >> which makes people happier. >> improves the immune system and promotes cooperation without anyone else thes us we have to. >> my producer got full frontal hugs by dozens of strangers. some people ran to her. >> she's running. >> she's running. we're doing this. >> so i'm in the my hug experiment and i'm probably about 40 hugs in. i've hugged men. i've hugged women. i've hugged children. the men i've hugged they hugged me a little too tightly. my dad's watching. he's not going to appreciate this. oh, this guy's coming in. he's going in. he's going in for the kill. he's going in. oh. >> i feel better. >> i feel fantastic. maybe dr. love is on to something. ♪ >> data show that this makes people happy the hug, but to do it scientifically, oxytocin how? >> so we infuse it into the nose, and it gets into the

dr. connie said, sometimes it's okay to let kids watch tv. here's a babysitting story from monique coleman. she's been on "the suite life of zack and cody." she also played taylor mckessie in the "high school musical" movies. monique says... of course, you don't have to be able to sing like a professional to be a good babysitter. the trick is to participate with your kids, rather than just sitting them in front of the tv. >> the purple heart is actually the military order of the purple heart, and george washington developed the ribbon, and it was awarded to three soldiers during the american revolution. in 1932, chief of staff of the army general macarthur was able to persuade congress to establish a new award called the purple heart. and those soldiers who were in world war i who were wounded received wound chevrons on their sleeves, and so all those soldiers later received the purple heart. and today the purple heart is awarded to any service member who is wounded or killed in action. >> coming up, i get to spend the day with some knights. i'll tell you all about it. i'd like to drop out of high school and get a meaningless job that mak