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a really weird logic to prove this fact within five seconds.

The rolling plains of Castilla-La Mancha are dominated by the windmills that provoked the fevered imagination of Don Quixote. But Spain's relentless investment in wind power and other renewable energy sources has proved wrong those who thought it was tilting at windmills. The sleek white wind turbines and hydroelectric plants that have sprung up across the country in recent years generated 30 per cent of Spain's energy this year for the first time.

Hydrogen cars get no respect. A lot of people consider them the stuff of science fiction, a technology as vaporous as the stuff that drives them. But despite some hurdles even Liu Xiang couldn't clear -- creating a fueling infrastructure comes to mind -- Uncle Sam and the big automakers love hydrogen cars and are driving across the country in a fleet of them to prove they work. Even if they're occasionally hauled on trucks.

When the tobacco industry was feeling the heat from scientists who showed that smoking caused cancer, it took decisive action. It engaged in a decades-long public relations campaign to undermine the medical research and discredit the scientists. The aim was not to prove tobacco harmless but to cast doubt on the science.

When it comes to tapping energy from the ocean, off-shore oil rigs are often what comes to mind. But the ocean itself is proving to be an efficient and environmentally friendly source of energy.

A former NASA scientist has used radio waves to transmit solar power a distance of 92 miles (148 km) between two Hawaiian islands, an achievement that he says proves the technology exists to beam solar power from satellites back to Earth. John C. Mankins demonstrated the solar power transmission for the Discovery Channel, which paid for the four month experiment and will broadcast the results Friday at 9 p.m. EDT. His vision is to transmit solar power collected by orbiting satellites as large as 1,102 pounds (500 kg) to lake-sized receiver stations on Earth.

Research by TU Delft proves that Dutch power stations are able to cope at any time in the future with variations in demand for electricity and supply of wind power, as long as use is made of up-to-date wind forecasts. PhD candidate Bart Ummels also demonstrates that there is no need for energy storage facilities. Ummels will receive his PhD on this topic on Thursday 26 February. Wind is variable and can only partially be predicted. The large-scale use of wind power in the electricity system is therefore tricky. PhD candidate Bart Ummels MSc. investigated the consequences of using a substantial amount of wind power within the Dutch electricity system. He used simulation models, such as those developed by Dutch transmission system operator TenneT, to pinpoint potential problems (and solutions).

A trend is spreading through small towns across Germany. Tight budgets have forced hard decisions, including turning the lights out at night. No one is on the streets at night anyway, so why pay for the electricity to run the street lights? But residents have revolted. They fear an uptick in crime, or simply for their safety while stumbling through the dark streets to walk the dog or return from a late night out. Proving necessity is the mother of invention, a handful of clever solutions are being implemented; some with interesting consequences. The solution seems to have started in the small town of Morgenröthe-Rautenkranz in the Erzegebirge. Over one and a half years ago, the 900 citizens of Morgenröthe-Rautenkranz were plunged into darkness each night, but given the option to turn the lights on by mobile telephone. Older citizens were concerned about their ability to master this new technology, but practice makes perfect. The first two weeks of the program, the lights remained on almost all night long as residents remained awake late for an opportunity to test the new system! But now the lights stay off except when needed. The town saves 4000 euros ($5300) per year. According to the Berliner Morgenpost daily newspaper, Morgenröthe-Rautenkranz is the inspiration for 4300 person community of Groß Pankow, the most recent community to consider on-call streetlight.

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