now you have to livelonger? now you have to extend what i only imagine is a miserable, miserable existence? a life of having to keep everything on the floors because you can't reach the shelves. you need a step stool to get into bed. i will be honest. never in my life have i felt sorry for short guys. they chose that lifestyle. i have to wonder would they have made that choice if they had known they would livelonger? >> you have to have the information. maybe you choose to play in the nfl. i think maybe you are not going to choose to be short knowing that you would have to extend your miserable existence. >> jed, ignore everything. you are actually racist. i believe being short is a race. a race of short people. >> elves. >> i am from middle earth, jedediah. what do you make of this study? >> i was thinking about it in the make up room in the three and a half minutes i had to prepare for this show and i was comparing the short and tall guys that i have dated. i found the shorter guys were much less anxiety ridde

people who give or volunteer are less depressed and have lower blood pressure and livelonger. >> fory give than when they get. >> those are the same pleasure centers that are lit up when you have sex and when you have -- when you fall in love and when you eat candy. >> "new york times" columnist and his wife have written a new book called "a path of tears" in which they issue a challenge to all of us. if we want a truly fulfilled life, we must give back. >> a lot of people feel there is not much i can do, especially looking at the problems out there. >> any one individual can't solve a problem in its entirety. but one individual can have a transform tiff impact. >> for 50 cents you candy worm a -- can de worm a child preventing a lifetime of health problems and for $50 you can buy books for a child, dramatically boosting their educational attainment. >> you say to do a little more. >> absolutely. we think if you fold into your life it becomes a part of your life. >> make giving a habit, they say. we now know it not only helps others, but it helps you. dan harris, abc news, new york.