No one wants to lift up their arm to find unsightly colored sweat stains under their arms. And this problem isn't limited to men -- women can have equally embarrassing perspiration problems. Do you know why they happen and how to get rid of them? Or, like most people, do you believe common myths about sweat stains? Take the quiz and find out.
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!