A study has found that happiness really is contagious. Unhappiness is not.
I’m tempted to make fun of the study, but I won’t. It does illustrate in yet another way that God designed us to need other people and so why Christians need to be part of a church. It also shows what we should realize by experience that getting involved with people who are suffering is not inherently “depressing” but is good for us. (Some of what I just said is my extrapolation rather than from the research itself, which is working with an oddly banal definition of happiness. But still.)