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A Brief History of the World’s First Planetarium

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The other would show the Ptolemaic, or geocentric, sky, with the viewer fully immersed in the view, as if standing on the surface of the Earth, seemingly at the center of the universe. The Zeiss Model I displayed 4,500 stars, the band of the Milky Way, the sun, moon, Mercury, Venus, Mars, Jupiter, and Saturn.

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Study finds heavy-petroleum fuels raising vanadium emissions; human emissions outpacing natural sources by factor of 1.7

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Breathing vanadium-rich aerosols has unknown but potentially adverse health impacts, according to the researchers, who note that the human impacts on the global vanadium cycle parallel impacts on the global cycles for lead and mercury. Human emissions of vanadium to atmosphere now exceed natural sources by a factor of 1.7 1715500114.

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Taking the Measure of the Earthquake That Destroyed Tokyo

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In Tokyo, the fires merged into a firestorm so intense that it created its own wind system and set alight the city’s many wooden buildings. Palmieri’s seismograph consisted of U-shaped tubes filled with mercury. When the ground shook, the mercury would close an electrical circuit and stop an attached clock.

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The Birth of Random-Access Memory

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Over the years, memory has been made up of vacuum tubes, glass tubes filled with mercury and, most recently, semiconductors. Williams , Tom Kilburn , and Geoff Tootill developed and built the machine and its storage system—the Williams-Kilburn tube—at the University of Manchester. One such researcher was British engineer F.C.

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Harvard study finds human health risks from Canadian hydroelectric projects

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In a new study, Harvard University researchers found more than 90% of potential new Canadian hydroelectric projects are likely to increase concentrations of the neurotoxin methylmercury (MeHg) in food webs near indigenous communities. The research is published in the ACS journal Environmental Science & Technology.

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Duke study finds China’s synthetic natural gas plants will have heavy environmental toll; 2x vehicle GHG if used for fuel

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Coal-powered synthetic natural gas (SNG) plants being planned in China would produce seven times more greenhouse gas emissions than conventional natural gas plants, and use up to 100 times the water as shale gas production, according to a new study by Duke University researchers published in the journal Nature Climate Change. —Robert B.

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Former CEO of American Electric Power Dies at 94

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He was awarded an honorary doctorate in business administration by Indiana University in Bloomington. While there, he suggested the company build more accurate calibration systems. Holt supplied calibration and measurement systems used for NASA 's Apollo, Gemini, and Mercury programs, and the company's devices are still used today.

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