A growing number of psychologists have set out to determine what makes the heart sing. Scientists are using Palm Pilots to gauge people's moment-to-moment levels of happiness.
Copyright 2005 NPR
Measuring Happiness with a Palm Reading
Corrected: February 15, 2005 at 10:16 AM EST
This story incorrectly stated the number of times that kidney-disease patients in the study underwent dialysis sessions. These patients underwent dialysis three times a week.
