If you've ever had a trickster tell you that your epidermis is showing, have no fear. Your pal is just being clever by telling you the top layer of your skin is visible. It would be pretty hard to hide all of your skin; after all, skin is the largest organ in the human body, at 22 square feet (2 square meters). Since your skin is bound to show sometime, you should know how to care for it. Test your knowledge on that very subject in this skin-tingling quiz.
How much do you know about how car engines work? And how much do you know about how the English language works? And what about how guns work? How much do you know? Lucky for you, HowStuffWorks is about more than providing great answers about how the world works. We are also here to bring joy to your day with fun quizzes, compelling photography and fascinating listicles. Some of our content is about how stuff works. Some is about how much you know about how stuff works. And some is just for fun! Because, well, did you know that having fun is an important part of how your brain works? Well, it is! So keep reading!