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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.
When did people start living on the edge of the desert?
A: ice age

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The process of polonization took place over a lengthy period of time. At first only the highest members of the nobility were involved, although gradually a wider group of the population was affected. The major effects on the lesser Lithuanian nobility took place after various sanctions were imposed by the Russian Empire such as removing Lithuania from the names of the Gubernyas few years after the November Uprising. After the January Uprising the sanctions went further, and Russian officials announced that "Lithuanians are Russians seduced by Poles and Catholicism" and began to intensify russification, and to ban the printing of books in the Lithuanian language.
What was an example of imposing sanctions on lithuanians?
A: removing Lithuania from the names of the Gubernyas

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In the Low Middle Ages, Catalan went through a golden age, reaching a peak of maturity and cultural richness. Examples include the work of Majorcan polymath Ramon Llull (12321315), the Four Great Chronicles (13th14th centuries), and the Valencian school of poetry culminating in Ausias March (13971459). By the 15th century, the city of Valencia had become the sociocultural center of the Crown of Aragon, and Catalan was present all over the Mediterranean world. During this period, the Royal Chancery propagated a highly standardized language. Catalan was widely used as an official language in Sicily until the 15th century, and in Sardinia until the 17th. During this period, the language was what Costa Carreras terms "one of the 'great languages' of medieval Europe".
What was the official language of Sicily until the 15th century?
A: Catalan

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DDT, sprayed on the walls of houses, is an organochlorine that has been used to fight malaria since the 1950s. Recent policy statements by the World Health Organization have given stronger support to this approach. However, DDT and other organochlorine pesticides have been banned in most countries worldwide because of their persistence in the environment and human toxicity. DDT use is not always effective, as resistance to DDT was identified in Africa as early as 1955, and by 1972 nineteen species of mosquito worldwide were resistant to DDT.
How supportive is Africa about DDT being banned?
A:
unanswerable