For decades, Margaret Sanger's ideas on feminism and family planning have been flashpoints for both liberals and conservatives. She set out to provide contraceptives for poor women -- and wound up enmeshed in all sorts of controversy. How much do you know about Sanger and her life?
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!