Various scales and charts have been developed to measure everything from the pungency of peppers to the intensity of earthquakes. Test your knowledge of some of them with these multiple choice questions...

The history of aviation is packed full of amazing aircraft, used both commercially and in military operations. How much do you know about these magnificent flying machines?

Test your knowledge of some common and unusual phobias with these multiple choice questions...

History is illuminated by the amazing discoveries of science! Test your knowledge of some of our most famous scientists with these multiple choice questions.