Research Dynamic spread of... Dynamic spread of happiness in a large social network: longitudinal analysis over 20 years in the Framingham Heart Study Research Dynamic spread of happiness in a large social network: longitudinal analysis over 20 years in the Framingham Heart Study BMJ 2008; 337 doi: https://doi.org/10.1136/bmj.a2338 (Published 05 December 2008) Cite this as: BMJ 2008;337:a2338 Jame
![Dynamic spread of happiness in a large social network: longitudinal analysis over 20 years in the Framingham Heart Study](https://cdn-ak-scissors.b.st-hatena.com/image/square/27640c65e66fade05301e8c02af91429b251e765/height=288;version=1;width=512/https%3A%2F%2Fwww.bmj.com%2Fsites%2Fdefault%2Ffiles%2Fhighwire%2Fbmj%2F385%2F8430.cover-source.jpg)