What a mood ring will always read correctly, Dr. Emrani says, is the temperature of your finger — and that's about it. Nevertheless, the basic science behind mood rings remains true.

Internet users have reacted angrily to news that Facebook researchers manipulated the content some users were shown in an attempt to gauge their emotional response.

In the wake of both the Snowden stuff and the Cuba twitter stuff, the Facebook “transmission of anger” experiment is terrifying. — Clay Johnson (@cjoh) June 28, 2014 ...

But another psychological paper published in the June 2014 issue of Computers in Human Behavior shows that Facebook might already be well behind the curve where their customers’ mood is ...

Let's look at the science behind a bad mood, what it does in your system, and what you can do to keep it at bay. Photo by bark . A bad mood can appear due to all kinds of different events.