For China’s burgeoning middle class, car ownership is perhaps the ultimate status symbol. Indeed, in January 2009, for the first time more cars were sold in China than in the United States. We wonder: The current number of cars per 1,000 people in China is equal to that of the United States in what year?
Antarctica is the fifth-largest continent — and is home to the coldest place on earth. As the world struggles to find a solution to global warming and melting ice in both the North and South poles, we wonder: What is the elevation of the South Pole?
Of the 78 million people added annually to the world's population of 6.8 billion, India and China get the gold and silver medals for the largest yearly contributions. They currently add 17.2 million and 7.7 million people, respectively — or 22% and 10% of the total yearly world increase. Which of the following countries would get the bronze medal for third place?
As a new President of the United States prepares to take over, historians and pundits are trying to decipher the legacy of George W. Bush. And with the U.S. economy in the doldrums, many are focusing on his administration's economic performance. We wonder: How do the presidencies of George W. Bush and of his father, George H.W. Bush (from 1989 to 1993), measure up historically?
Amid growing public awareness about the dangers of global warming, business and political leaders — as well as everyday citizens — are trying to find ways to reduce carbon dioxide emissions. We wonder: What is the current atmospheric concentration of carbon dioxide?