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China's new "Rejuvenation" bullet trains can reach maximum speeds of about 250 mph (400 km/h). China was once home to the world's fastest trains,

Wear and tear can damage lenses in disposable eclipse glasses, making them unsafe to use.   The 2017 total solar eclipse has come and gone, but another one is less than a decade away for North America.

For the first time, researchers have used neural networks to analyze gravitational lenses, characterizing the distortions in space-time 10 million times faster than traditional methods can do so.