Alone We Are Rare, but Together We Are Strong: Orphan Diseases Quiz
by Staff

They affect between 420 and 560 million people around the world, yet account for less than 10 percent of global pharmaceutical spending. Take this quiz to see how much you know about conditions known as "orphan" diseases and how they're treated.

Read More
Scroll to Begin 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!