The human mind is an area that has been studied for thousands of years, yet very little is understood about it. While the chemicals which cause emotions can be quantified, the emotions themselves, the inner feelings which drive day to day decisions, are as much a mystery now as they were to the ancient philosophers. Subtle factors play a role in your mood, and many things can affect your mood without you realizing it. Just the same, you can affect other’s. Here are ten unexpected factors that manipulate your emotions day in and day out.