If you have ever had a runny nose, you probably know what snot is and you have probably noticed that it can change color and texture from time to time. It can be transparent, green, black, or other colors in between.5-Minute Crafts will tell you more about what snot is, why our body needs it, and what its color means. Don’t miss the bonus at the end of the article where we clear up a fundamental question: should you, or should you not, eat boogers?