Today's teens face more distractions than any generation before. Many don't recall a time when they were not continuously connected to their friends. Cell phones - which might have been provided as a safety precaution in case Mom or Dad was running late picking them up from school - are now the source of constant messaging, sharing and media consumption.

On any given day, some 40 million Americans stop at gas stations to fill their tanks. For many, it's a weekly routine, one they don't spend much time analyzing, but are there things you think you know about your fill-up that just aren't true?

You begin Monday in your usual morning mood - grumpy. The day quickly turns around, however, after hearing a few funny stories from co-workers. Suddenly you find yourself laughing and enjoying the morning. Your outlook is positive and your spirits have been lifted, and all it took was one hilarious joke. It has to make you wonder: Why don't we laugh more often?