An “X” sign installed on Twitter’s San Francisco headquarters on Friday as part of the company’s rebranding is under investigation by the city for lacking proper permits, according to officials. “A building permit is required […]
Federal investigators renewed their recommendation that major freight railroads equip every locomotive with the kind of autonomous sensors that could have caught the track flaws that caused a fatal 2021 Amtrak derailment in northern Montana. […]
A Number That Sums It Up: 3 to 4 months to Mars What if a spacecraft could get to Mars in half the time it currently takes? Every 26 months or so, Mars and Earth […]
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