Homemade 3D-printed perpetual motion electricity generator.

Estimated run time with ceramic bearings over 10 years...

Estimated maintenance time to change bearings 10 minutes.

Total power output 5000 watts continuous use.

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Leonardo da Vinci's bridge design from 1502.

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We just don't know the existence of most of search systems.

Meanwhile, there are still a huge number of excellent searchers in the world who specialize in books, science, other smart information.

Keep a list of sites you never heard of.

www.refseek.com - Academic Resource Search. More than a billion sources: encyclopedia, monographies, magazines.

www.worldcat.org - a search for the contents of 20 thousand worldwide libraries. Find out where lies the nearest rare book you need.

https://link.springer.com - access to more than 10 million scientific documents: books, articles, research protocols.

www.bioline.org.br is a library of scientific bioscience journals published in developing countries.

http://repec.org - volunteers from 102 countries have collected almost 4 million publications on economics and related science.

www.science.gov is an American state search engine on 2200+ scientific sites. More than 200 million articles are indexed.

www.base-search.net is one of the most powerful researches on academic studies texts. More than 100 million scientific documents, 70% of them are free.

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A climatic catastrophe rocked the Earth in A.D. 535, causing two years of darkness, famine, drought and disease. Was it a comet? An asteroid? A volcano?

Written records from China, Italy, Palestine and many other countries suggest a huge catastrophe blighted the world in 536 AD. But the cause of it has been uncertain. Archaeologist David Keys reveals that a volcano is to blame for the Dark Ages of famine and plague that shaped the world order of today.

From the ancient civilizations of years past to the dawn of the Space Race, every week we'll be bringing you award-winning documentaries featuring some of the world's best historians.

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The Sahara is the biggest desert on earth... it takes its name from the Arab word for "emptiness".
In the dead heart of that emptiness there's a place called the Tenere. The Tenere takes its name from the Tuareg word for "nothing". A nothing the size of France in the middle of an emptiness the size of the United States. It's no wonder the locals call this place "The Land Of Fear”. David Adams retraces the trade routes of the people who call this stove-hot corner of the planet home.

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Archaeologists in Turkey have uncovered colossal 3,000-year-old swords from a long-lost civilization, shrouding the mysteries of its warriors and their unparalleled craftsmanship in deeper intrigue.

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Pompeii has been frozen in time since the eruption of Mount Vesuvius in 79 AD. But now, more secrets behind the ancient Roman city are being revealed with the help of new technologies. Pompeii is a delicately conserved attraction that is under constant threat from the wears and tear of extensive tourism, the specter of landslides and the possibility of another devastating eruption from Mount Vesuvius.

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An unmanned car invented in 1928!

Opel developed a driverless car in 1928...

With what technology?

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"Old World"

It wasn't the deep Middle Ages as we were told.

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In the 1930's an inventor created energy by using the force of gravity. If this had become mainstream we could of powered the world for peanuts without any environmental damage.

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Pompeii, the lost Roman city buried by the eruption of Vesuvius in 79 AD, has long been a source of fascination to archaeologists. But its sister city Herculaneum, buried in the same eruption but to a much greater depth than Pompeii, reveals far more detail of how the Romans lived. For many years the city appeared to have been abandoned and it was assumed the inhabitants had managed to escape in the hours before Herculaneum was engulfed by the volcano.

Then in the 1980s a macabre discovery was made. Burrowing through the volcanic mud, archaeologists found hundreds of bodies huddled pitifully together. Vesuvius is still active and is on course to erupt again. The lure of its rich volcanic soil and the delights of the Bay of Naples have attracted a far greater population than lived there in Roman times. And while civil servants at the Vesuvius observatory express confidence that there will be ample warning and time to evacuate the surrounding population, many geologists disagree. Evidence from an eruption in 4000 BC reveals that the volcano is capable of destroying Naples, a cataclysm far greater than that of 79 AD. If that were to happen today it could engulf 3 million people. On that scale, in an area where motorway traffic jams are a fact of daily life, present evacuation plans are completely inadequate.

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In the 1899 interview, Nikola Tesla said that and I quote:

"Everything is the Light, I am part of a light, and it is the music. The Light fills my six senses: I see it, hear, feel, smell, touch and think. Thinking of it means my sixth sense. Particles of Light are written note”.

He also goes on to say that "Light is the primary source of Creation, in one its ray is the fate of nations, each nation has its own ray in what great light source we see as the Sun."

Imagine this was back when science at that time couldn't even begin to understand the atomic level of particles, let alone the sub-atomic levels.

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There was a farmer who grew excellent quality corn.

Every year he won the prize for the best corn grown. One year a reporter interviewed him and discovered something interesting about the way he grew corn. The reporter discovered that the farmer shares his seeds with his neighbors. "Why does he share his best seeds with his neighbors if every year they compete with his own?" the reporter asked him.

Why, sir? the farmer replied, didn't you know? The wind picks up the pollen from the ripe corn and swirls it from one field to another. If my neighbors grow inferior corn, cross-pollination will constantly degrade the quality of my corn. If I want to grow good corn, I must help my neighbors grow good corn.

The same is true of our lives. Those who want to live good and meaningful lives must help enrich the lives of others, because the value of a life is measured by the lives it touches, and those who choose to be happy must help others find happiness.

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