These fuzzy fellas aren't cute at all. In fact, they often grow to stink. If you're not careful, they'll attack your food faster than the class glutton. What are they? Mold spores.
If you've never seen them close up, you could try leaving your sandwich in your lunchbox for a few days. But here's a better, safer way to get up close to them.
But first, what exactly is mold?