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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?
Answer: ice age
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Normal functioning of the kidney, brain, liver, heart, and other systems can be affected by uranium exposure, because, besides being weakly radioactive, uranium is a toxic metal. Uranium is also a reproductive toxicant. Radiological effects are generally local because alpha radiation, the primary form of 238U decay, has a very short range, and will not penetrate skin. Uranyl (UO2+
2) ions, such as from uranium trioxide or uranyl nitrate and other hexavalent uranium compounds, have been shown to cause birth defects and immune system damage in laboratory animals. While the CDC has published one study that no human cancer has been seen as a result of exposure to natural or depleted uranium, exposure to uranium and its decay products, especially radon, are widely known and significant health threats. Exposure to strontium-90, iodine-131, and other fission products is unrelated to uranium exposure, but may result from medical procedures or exposure to spent reactor fuel or fallout from nuclear weapons. Although accidental inhalation exposure to a high concentration of uranium hexafluoride has resulted in human fatalities, those deaths were associated with the generation of highly toxic hydrofluoric acid and uranyl fluoride rather than with uranium itself. Finely divided uranium metal presents a fire hazard because uranium is pyrophoric; small grains will ignite spontaneously in air at room temperature.

Along with the heart, brain and liver, what system is notably affected by exposure to uranium?
Answer: kidney
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Banking has traditionally been one of the strongest service export sectors in Uruguay: the country was once dubbed "the Switzerland of America", mainly for its banking sector and stability, although that stability has been threatened in the 21st century by the recent global economic climate. The largest bank in Uruguay is Banco Republica (BROU), based in Montevideo. Almost 20 private banks, most of them branches of international banks, operate in the country (Banco Santander, ABN AMRO, Citibank, Lloyds TSB, among others). There are also a myriad of brokers and financial-services bureaus, among them Ficus Capital, Galfin Sociedad de Bolsa, Europa Sociedad de Bolsa, Darío Cukier, GBU, Hordeñana & Asociados Sociedad de Bolsa, etc.

What has traditionally been the strongest service export sectors in Uruguay?
Answer:
Banking