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Blog – Page 10113

The ancient Aztecs first picked the spot. They built their city atop the huge lakes that filled this valley, leaving the natural freshwater supply intact around them. The city flooded back then too, but the Aztecs, probably the last civilization to properly manage this watershed, built a system of dikes to control the problem.

The “historic mistake” kicked in around the 1600s, when Hernándo Cortés and his band of conquerors arrived. To make room for their expanding empire, over a few hundred years, they slowly but surely drained all the valley’s lakes.

By the 20th century, long after Mexico’s independence from Spain, the fresh surface water was mostly gone and the hunt for new sources had taken over. Hundreds of miles of pipes now bring in about 30 percent of the city’s water needs from faraway rivers and lakes. The rest comes from the valley’s vast underground aquifer.

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(HealthDay)—The ancient practice of tai chi may beat strength training and aerobics for preventing falls among seniors, a new trial shows.

A modified senior-centered tai chi program reduced falls nearly a third better in a head-to-head comparison with an exercise regimen that combined aerobics, strength training and balance drills, the researchers reported.

“This tai chi program better addressed the deficits that were contributing to fall risk,” said senior researcher Kerri Winters-Stone, a professor with the Oregon Health & Science University School of Nursing.

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Alzheimer’s disease (AD) is a neurodegenerative disease with characterization of deficits in progressive memory loss, cognitive and behaviour functions. Mild cognitive impairment (MCI) is a predromal stage of AD, displaying cognitive deficit but neither marked functional impairment nor satisfying established clinical criteria for dementia or probable AD. However, not all MCI patients may eventually progress to AD (progressive MCI, pMCI)https://doi.org/10.1016/j.nicl.2013.10.

(2014)." href="https://www.nature.com/articles/s41598-018-31794-8#ref-CR2" id="ref-link-section-d1856e5935"]2, and some remain unchanged (stable MCI, sMCI), or are recovered from. Therefore, differential diagnosis of MCI types and earlier diagnosis of AD and prediction of disease evolution are difficult

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Scientists don’t know exactly what fast radio bursts (FRBs) are. What they do know is that they come from a long way away. In fact, one that occurs regularly comes from a galaxy 3 billion light years away. They could form from neutron stars or they could be extraterrestrials phoning home. The other thing is — thanks to machine learning — we now know about a lot more of them. You can see a video from Berkeley, below. and find more technical information, raw data, and [Danielle Futselaar’s] killer project graphic seen above from at their site.

The first FRB came to the attention of [Duncan Lorimer] and [David Narkevic] in 2007 while sifting through data from 2001. These broadband bursts are hard to identify since they last a matter of milliseconds. Researchers at Berkeley trained software using previously known FRBs. They then gave the software 5 hours of recordings of activity from one part of the sky and found 72 previously unknown FRBs.

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