Originally a solution to the space problem, skyscrapers have come to symbolise ambition and transcendence. See how much you know about these iconic buildings.

A Stock Symbol - or Ticker - is a series of characters (usually letters) that represent the company on a stock exchange. Most are simple abbreviations of the company name but some are more creative than that. Test your knowledge of some of the best ticker symbols with these multiple choice questions...

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...

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.