Hygiene has been on everyone's minds as of late, brought on by a fear of potentially deadly germs. Washing your hands is a way to fend off everything from salmonella to the coronavirus to the common cold. Invisible particles on your hands can cause diarrhea, fever, or stomach bleeding. It's particularly important to wash after using the restroom or changing a diaper. Even raw meat can contain undetectable traces of feces on its surface, which can ultimately lead to illness. We'll look at why you should wash your hands and what can happen if you don't.