Think of cool, refreshing blue waters, the brilliant greens and pinks of coral reefs, and myriad exotic fish. No wonder scuba diving is such a popular sport! If you want to learn how to become certified as a diver, your first port of call is PADI. Take our quiz to learn about the world's preeminent diving organization.
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!