The problem: Answer a question about this article:
People lived on the edge of the desert thousands of years ago since the last ice age. The Sahara was then a much wetter place than it is today. Over 30,000 petroglyphs of river animals such as crocodiles survive, with half found in the Tassili n'Ajjer in southeast Algeria. Fossils of dinosaurs, including Afrovenator, Jobaria and Ouranosaurus, have also been found here. The modern Sahara, though, is not lush in vegetation, except in the Nile Valley, at a few oases, and in the northern highlands, where Mediterranean plants such as the olive tree are found to grow. It was long believed that the region had been this way since about 1600 BCE, after shifts in the Earth's axis increased temperatures and decreased precipitation. However, this theory has recently been called into dispute, when samples taken from several 7 million year old sand deposits led scientists to reconsider the timeline for desertification.
What area of the Sahara is full of vegetation?
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The answer: the Nile Valley


The problem: Answer a question about this article:
Switzerland is one of the richest and wealthiest countries in the world. Switzerland ranks top or close to the top in several metrics of national performance, including government transparency, civil liberties, quality of life, economic competitiveness, and human development. It has the highest nominal wealth (financial and non-financial assets) per adult in the world according to Credit Suisse and the eighth-highest per capita gross domestic product on the IMF list. Zürich and Geneva have each been ranked among the top cities with the highest quality of life in the world, with the former ranked 2nd globally, according to Mercer.
Which country has the highest nominal wealth per adult in the world according to Credit Suisse?
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The answer: Switzerland


The problem: Answer a question about this article:
In June 1982, Diego Maradona was signed for a world record fee of £5 million from Boca Juniors. In the following season, under coach Luis, Barcelona won the Copa del Rey, beating Real Madrid. However, Maradona's time with Barcelona was short-lived and he soon left for Napoli. At the start of the 1984–85 season, Terry Venables was hired as manager and he won La Liga with noteworthy displays by German midfielder Bernd Schuster. The next season, he took the team to their second European Cup final, only to lose on penalties to Steaua Bucureşti during a dramatic evening in Seville.
Who did Barcelona defeat the season following the signing of Maradona?
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The answer: Real Madrid


The problem: Answer a question about this article:
Tajikistan has a population of 7,349,145 (July 2009 est.) of which 70% are under the age of 30 and 35% are between the ages of 14 and 30. Tajiks who speak Tajik (a dialect of Persian) are the main ethnic group, although there are sizable minorities of Uzbeks and Russians, whose numbers are declining due to emigration. The Pamiris of Badakhshan, a small population of Yaghnobi people, and a sizeable minority of Ismailis are all considered to belong to the larger group of Tajiks. All citizens of Tajikistan are called Tajikistanis.
What percent of the population are between 14 to 30 years old?
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The answer:
35%