Fingernails are an odd thing if you really think about them. What are they there for, anyway? And why do we file, buff and paint them outrageous colors? Nails are for more than decoration, though. Did you know that they can indicate if you have serious health problems? Take our quiz to find out what could be wrong if you have yellow or purple nails.
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!