The Surprising Reason Why Some People Smile More

Source: Yahoo News - ScienceIt turns out, whether you're quick to laugh and smile may be partly in the genes. "One of these big mysteries is why do some people laugh a lot, and smile a lot, and other people keep their cool," said study co-author Claudia Haase, a psychology researcher at Northwestern University in Evanston, Illinois. The gene was previously tied to depression and other negative states, but the new study suggests it may be linked to people experiencing more...