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And each building can save energy through automation, including ultrasonic sensors that help turn off the lights when the occupant leaves the room, light sensors that allow the lights to operate only after sunset and touch sensors that turn off water taps after a certain time or if the tenant leaves the room.

And since he first arrived in the village in 2016, more and more residents of Yugouliang are attending his daily yoga sessions.

Analysts said natural gas has become China's fastest-growing fuel in recent years.

Analysts can only speculate about the number of Prime subscribers nationwide. Amazon is tight-lipped when it comes to that data.?But we do know one thing for certain: The e-commerce giant is adding subscribers to its per month membership program at a breakneck pace.

And in January, the WSJ reported that Amazon had plans to offer brick-and-mortar retailers a checkout system that uses its Kindle tablets. To accelerate that program, it had acquired technology and hired some engineers from GoPago, a San Francisco startup that had begun developing check-out systems using smartphone apps.