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Here are the answers for The New York Times Mini Crossword for Dec. 28.
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 Researchers at China's National University of Defense Technology (NUDT) have accelerated a one-ton vehicle from a dead stop to 435 mph (700 km/h) in under two seconds - then back to zero mph on about a 1/4 mile (1,312 ft / 400 meter) magnetic levitation test track. It's not just fast - it's absurd. That makes it the quickest superconducting maglev acceleration ever demonstrated.
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 Have you been good this year? If so, you may be interested to know that Google has launched its annual Santa tracking feature, allowing Santa to be tracked in real time on his journey to the North Pole as he prepares to deliver presents to children around the world.
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