dr. christine carter is back with us and says now we have to recharge your body. what is the connection between the mind and body and spirit. how does it fit together? >> one connection, if you can't think your way to happiness, sometimes we can't, right, we can use our bodies to make changes in our nervous system which can boost our mood a little bit. dr. oz: the first of the changes you point out that can be a huge booster for us is to fake a smile. everyone has a pencil. you are going to find out why the pencils are so important. how does it help? >> facial expression alone, believe it or not, without the corresponding emotion behind it can be enough to create changes in our nervous system. if you put the pencil behind your, bite it in your back teeth. dr. oz: everybody do it. >> what you're doing here is you're triggering your smile muscles. that is enough, if you do this for a minute or so -- [laughter] dr. oz: look at yourself. >> come on! you do this for a minute or so and your heart rate is going to drop. you're going to feel a little bit happier. you are

. >> 85-year-old sibling of dr. martin luther king, christine king. she's two years older than dr. king. but you see there his only surviving sibling. we're expecting to hear now from bernice king. let's listen in. >> president obama, mrs. obama, presidents carter and clinton, congressman lewis, ambassador young, to my brother martin iii, dexter scott king, and to my entire family, i was 5 months old when my father delivered his "i have a dream" speech, and i probably was somewhere crawling on the floor or taking a nap after having a meal. but today is a glorious day because on this program today we have witnessed a manifestation of the beloved community. and we thank everyone for their presence here today. today we have been honored to have three presidents of the united states. 50 years ago the president did not attend. today we are honored to have many women in the planning and mobilization of the 50th anniversary of the march on washington. 50 years ago there was not a single woman on the program. today we are honored to have not just one young person but several young people o