Happiness By The Numbers.62Distance from home, in miles, at which point people's tweets begin declining in expressed happiness (about the distance expected for a short work commute).

40The percentage of our capacity for happiness that is within our power to change, according to University of California, Riverside researcher Sonja Lyubomirsky.

85Number of residents out of every 100 who report feeling positive emotions in Panama and Paraguay, the most positive countries in the world.

20The percentage of the U.S. population wealthy enough that their feelings of happiness are not affected by fluctuations in Americans' income equality.

Only 20% of Americans feel wealthy enough that their happiness is not affected by income.

Wow.