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...

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

Mathematics is fundamental to our understanding of the world around us. Test your knowledge of this fascinating subject with these multiple choice questions.

More than fifty years after man first walked on the moon, space exploration continues to capture human imagination. Test yourself with these questions...