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Australian rock art

10.05.2011

In the north of Australia, in the area where people who sailed from Indonesia are believed to have landed for the first time 50-60 thousand years ago, archaeologists have found thousands of drawings made on the rocks with red and orange mineral paints. Moreover, so far the expedition has studied only ten square kilometers of the vast rocky desert, where the drawings are found.

Apparently, over the centuries and millennia, the style and content of the drawings changed: over the elongated figures of people, often armed with boomerangs and darts, images of local animals were later applied with a brighter pigment. It is not yet possible to determine the age of this art gallery in the desert. Carbon-14 dating requires organic matter, which ancient paints do not have.

Only on one "fresco" was found a long-dried nest of wasps - it is 17 years old (this coincides with the age of the drawings of a prehistoric man in the French cave of Lascaux). So the drawing is older than the hornet's nest. But for a more accurate determination, it is necessary to analyze the paints using X-rays, and for this it is necessary to deliver an X-ray spectrometer to the desert.

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GM Precept concept car 22.05.2002

At the Detroit Auto Show in January 2002, the GM Precept concept car was unveiled.

According to the US government's program to create a new generation of cars, such cars can appear on the streets in 5 years. The GM Precept is equipped with an efficient internal combustion engine with lean-burn direct injection, which is mounted at the rear and is driven to the rear axle.

Under the hood of the Precept is a second, electric three-phase motor with a power of 35 kW. The most important element of the whole system is a special node, located at the rear of the chassis, whose main tasks are to regenerate energy during braking, when it works like a generator, and add power during acceleration.

The on-board computer with a speed of 266 MHz is in a constant exchange of information with almost all machine systems and chooses the option of their interaction that optimizes energy consumption and reduces emissions of harmful substances.

The teardrop shape, the rejection of the front radiator and rear-view mirrors (they are replaced by 3 miniature cameras that transmit the image to the LCD screen), as well as the air intake in the rear wheel area, provided the new car with the world's best drag coefficient.

Thus, the Precept is like a bridge connecting us to the world of cars, which will become familiar in ten years.

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