. >> jen itically, wired to be kindness.ur deepest identity. >> david hamilton, a former chemist from scotland. >> it's unhealthy. not being kind, we feel separate, disconnected. unhappy. and some things. >> and, some of it. >> he made a career, lecturing, writing how kindness isn't something we do. or something we feel. it is something our bodies, actually need. >> being kind because it makes you feel warm and connected. changes the internal, biochemistry of your body. >> there is a physical effect. >> physical effect. >> the opposite of strels. >> really. there is a hormone that its troe -- that is produced every time we do something kind. it is the can iness hormone. >> one thing it does. it softens the walls of the arteries. almost. funny. like, like a, as you become softer towards people, so you softer on the inside actually. softens the walls of the arteries. when that happens. the heart doesn't have to push as hard to get the blood through. blood pressure drops. >> you can get that healthy effect by doing nothing more