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An Amazon Fresh truck goes out for deliveries. (Image by Atomic Taco, via Flickr – CC BY-SA 2.0).
An autonomous sense-and-avoid navigation system keeps the drone?from running into other objects on the way to its destination, at an altitude of up to 400 feet.?Researchers at the Massachusetts Institute of Technology showed off a sense-and-avoid system last month, but that one was designed to handle obstacles at a mere 30 mph?– half the speed that’s built into Amazon’s specs.
An also took Helen's typewriter from the 1930s, after buying her another one from a local antique store. "Helen stuck to manual typewriters throughout her life," An said.
An investigative team, comprised of local officials as well as 11 experts from Tsinghua University and Southeast University, concluded that the incidents were a result of weak aluminum pillars and shoddy design.
An employee checks coal handling equipment at a port in Hebei province. [Photo/Xinhua]
