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Space Shuttle Images Reveal Ancient Egyptian Lake Bed

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Space Shuttle Images Reveal Ancient Egyptian Lake Bed

A huge lake once waxed and waned deep in the sandy heart of the Egyptian Sahara, geologists have found.

sciencenewsRadar images taken from the space shuttle confirm that a lake broader than Lake Erie once sprawled a few hundred kilometers west of the Nile, researchers report in the December issue of Geology. Since the lake first appeared around 250,000 years ago, it would have ballooned and shrunk until finally petering out around 80,000 years ago.

Knowing where and when such oases existed could help archaeologists understand the environment Homo sapiens traveled while migrating out of Africa for the first time, says team leader Ted Maxwell, a geologist at the Smithsonian National Air and Space Museum in Washington, D.C. Modern humans arose in Africa about 200,000 years ago.

“You realize that hey, this place was full of really large lakes when people were wandering into the rest of the world,” he says.

Since then, desert winds have eroded and sands have buried much of the region’s landscape, says Maxine Kleindienst, an anthropologist at the University of Toronto. But during next summer’s field season, she and her colleagues will be checking for ancient shorelines at the elevations suggested in the new paper.

Other studies have found evidence of mega-lakes in Chad, Libya and Sudan at various points over the past 250,000 years. The new study targeted Egypt, some 400 kilometers west of the Nile, where in the 1980s researchers reporting finding fish fossils in the desert.

That discovery, says Maxwell, triggered scientists to think about how those fish could have gotten there. In 2000, astronauts on the space shuttle Endeavour used a radar instrument to take high-resolution pictures of the area’s topography. Maxwell and his colleagues recently analyzed those pictures to deduce how water would have drained across northeastern Africa over the past few hundred thousand years, ever since the Nile was born.

In Egypt, west of the Nile Valley in a region known as Tushka, the researchers spotted a low-lying area where water would have pooled after overflowing from the river, carrying fish with it. At its maximum, this ancient lake would have stretched for 350 kilometers, down to the modern-day Sudan border.

At the time, the Tushka area had more rainfall than today and would have been covered by grasslands, says Maxwell. Heavy rain in highlands to the south, from where the Nile flows, would have caused the lake to grow; dry spells shrank it. “This lake was going up and going down in size, doing all kinds of things over multiple thousands of years,” he says.

Something similar is going on today at a smaller scale, says Mohamed Abdelsalam, a geologist at the Missouri University of Science and Technology in Rolla. Just northeast of where the huge paleolake once lay, the Nile also overflowed, starting in 1998. A series of five small “new lakes of the Sahara” was born. Deprived of water since 2003, these lakes have since almost entirely dried out, says Abdelsalam.

Today, for water, Egyptians rely almost exclusively on the Nile and its annual floods. The ancient lakes, says Maxwell, suggest that such flooding was already under way, at least to some degree, a quarter million years ago.

Image: At perhaps its greatest extent, the Tushka lake would have covered more than 68,000 square kilometers (shown in false color topographical image at left). At other times (right) less water would have flown into the low-lying basin from the Nile (visible on the right in both images), causing the lake to shrink. Red corresponds to an elevation of 400 meters above the basin floor. Credit: T.A. Maxwell et al./Geology 2010

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Jesus and the Pharisees: Here is what world famous have said about Jews

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Here is what world famous have said about Jews

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Jesus and the Pharisees: Uncle Esau comes from the Khazars in southern Russia

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Uncle Esau comes from the Khazars in southern Russia

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Jesus and the Pharisees: We have conquered you without bullets, blood, turmoil, or force.

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We have conquered you without bullets, blood, turmoil, or force.

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Jesus and the Pharisees: It is our Uncle Esau who is the liar in Rev 3:9 and 2:9

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It is our Uncle Esau who is the liar in Rev 3:9 and 2:9

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Jesus and the Pharisees: We be not born of fornication John 8:41

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We be not born of fornication John 8:41

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Jesus and the Pharisees: Ben Franklin said that we should exclude Jews from America in the 1787 convention

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Ben Franklin said that we should exclude Jews from America in the 1787 convention

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Jesus and the Pharisees: Who are these pharisees today?

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George Gordon's Radio Library

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George Gordon's School of Law

George Gordon's Radio Library

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FTC Backs ‘Do Not Track’ Browser Setting

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FTC Backs ‘Do Not Track’ Browser Setting

The nation’s top consumer protection agency came out Wednesday in favor of tougher restrictions on online data collection, backing a “Do Not Track” setting in browsers and proposing that companies make it easier for individuals to see the data collected about them.


The FTC’s 122-page draft privacy report (.pdf) comes after more than a year of hearings, and a string of complaints and lawsuits against online ad companies for surreptitiously collecting data on internet users. The online advertising industry has long argued that it can police itself, but today’s report said those efforts haven’t worked.


“Industry efforts to address privacy through self-regulation have been too slow, and up to now have failed to provide adequate and meaningful protection,” the draft report said.


The FTC’s head Jon Leibowitz went further in a call with reporters.


“Self regulation of privacy is not working for American consumers,” Leibowitz said.


And in a thinly-veiled warning to online companies to clean up their acts, he added, “A legislative solution will surely be needed if industry doesn’t step up to the plate.”


The most prominent of those efforts has been the National Advertising Initiative that purports to give internet users a one-stop shop for opting out of advertising networks that track what users do online to build profiles in order to serve targeted advertisements. That system works via cookies in your browser that tell an advertising network such as Google’s DoubleClick system that puts ads on non-Google websites.


But that system has been buggy, inconsistent and often used identifiable tracking cookies to set a preference not to be tracked. Those practices were exposed by outspoken security and privacy researcher Christopher Soghoian, who subsequently worked for and then left the FTC.


The “Do Not Track” proposal endorsed by the FTC simplifies the process of opting out. The idea is that users would be able to choose to have their browser tell any website not to track them for advertising purposes, and that setting wouldn’t be wiped out if a user clears her browser cookies, as currently happens with opt-out cookies.


But the FTC says “Do Not Track” is not just about behavioral advertising. It could apply to any service, such as Google Analytics, that have to do with “sites and servers that build up a profile of what an individual does online,” according to the FTC’s incoming staff technologist Professor Ed Felten.


Leibovitz called on browser makers — including Google, Mozilla, Microsoft and Apple — to build in “Do Not Track” technology and called out Adobe for privacy problems in its ubiquitous Flash plug-in, which some advertisers are now using to place tracking cookies that can’t be controlled by browser settings. Unlike the “Do Not Call” list, users will not have to register with a government database.


It’s not clear that the FTC has the power to force advertisers to obey the browser setting, and called for voluntary cooperation from the online ad industry. The agency could, however, go after companies that pledge to obey but then do not. To force compliance, the FTC would likely need Congress to pass legislation but the current report makes no recommendations for new legislation.


The report also calls for companies to make it easier for individuals to see the information collected about them. Some online advertising companies, including Yahoo and Google, allow individuals to see what topics the companies have inferred that they are interested in.


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