If you've got a job where constant smiling is required, you may want to check out this story. Apparently, a German psychologist is claiming that smiling too often can cause stress, depression, and heart problems.
Ok, so you clearly need to take this story with a grain of salt, but maybe you should bookmark so that next time your boss asks you to smile more, you can tell him you're just watching your health.
File that under frowning saves lives.
[tags]smiling, stress[/tags]