Our planet is full of fascinating creatures with unique characteristics and often awe-inspiring abilities. Test your knowledge of the animal kingdom with these multiple choice questions.

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...

Charles ‘Chuck’ Yeager was an American Air Force Officer and test pilot known for his historic breaking of the sound barrier in 1947. Test your knowledge of this supersonic flight pioneer with these multiple choice questions...