What if we didn't have snot and mucus? The inside of our bodies would be very dry, and we would find it very hard to digest our food. We would also quickly become sick, because mucus protects us from dirt in the air that we breathe. But what exactly is this sticky, slimy stuff and why do we produce more of it when we have a cold? What do animals like slugs and snails do with their mucus? You may find it a bit gross, but you wouldn t want to live without it!
