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...

Test your knowledge of some common and unusual phobias 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?

For around half a century, Mars has been the subject of exploration by space scientists keen to understand its evolution and search for signs of life. Test your knowledge of our nearest neighbour with these multiple choice questions...