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An anonymous reader quotes a report from the BBC: Experts at the University of Edinburgh carried out a post-mortem brain examination on 25 cats which had symptoms of dementia in life, including confusion, sleep disruption and an increase in vocalization. They found a build-up of amyloid-beta, a toxic protein and one of the defining features of Alzheimer's disease. The discovery has been hailed as a "perfect natural model for Alzheimer's" by scientists who believe it will help them explore new treatments for humans. Dr Robert McGeachan, study lead from the University of Edinburgh's Royal (Dick) School of Veterinary Studies, said: "Dementia is a devastating disease -- whether it affects humans, cats, or dogs. Our findings highlight the striking similarities between feline dementia and Alzheimer's disease in people. This opens the door to exploring whether promising new treatments for human Alzheimer's disease could also help our ageing pets." [...] Previously, researchers have studied genetically-modified rodents, although the species does not naturally suffer from dementia. "Because cats naturally develop these brain changes, they may also offer a more accurate model of the disease than traditional laboratory animals, ultimately benefiting both species and their caregivers," Dr McGeachan said. [...] Prof Danielle Gunn-Moore, an expert in feline medicine at the vet school, said the discovery could also help to understand and manage feline dementia. The findings have been published in the European Journal of Neuroscience.

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United Launch Alliance's Vulcan Centaur rocket successfully completed its first-ever national security mission, launching the U.S. military's first experimental navigation satellite in 48 years. Space.com reports: The mission saw the company's powerful new Vulcan Centaur rocket take off from Space Launch Complex 41 (SLC-41) at Cape Canaveral Space Force Station in Florida. Vulcan launched with four side-mounted solid rocket boosters in order to generate enough thrust to send its payload directly into geosynchronous orbit on one of ULA's longest flights ever, a seven-hour journey that will span over 22,000 miles (35,000 kilometers), according to ULA. The payload launching on Tuesday's mission was the U.S. military's first experimental navigation satellite to be launched in 48 years. It is what's known as a position, navigation and timing (PNT) satellite, a type of spacecraft that provides data similar to that of the well-known GPS system. This satellite will be testing many experimental new technologies that are designed to make it resilient to jamming and spoofing, according to Andrew Builta with L3Harris Technologies, the prime contractor for the PNT payload integrated onto a satellite bus built by Northrop Grumman. The satellite, identified publicly only as Navigation Technology Satellite-3 (NTS-3), features a phased array antenna that allows it to "focus powerful beams to ground forces and combat jamming environments," Builta said in a media roundtable on Monday (Aug. 11). GPS jamming has become an increasingly worrisome problem for both the U.S. military and commercial satellite operators, which is why this spacecraft will be conducting experiments to test how effective these new technologies are at circumventing jamming attacks. In addition, the satellite features a software architecture that allows it to be reprogrammed while in orbit. "This is a truly game-changing capability," Builta said.

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