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EntertainmentUnmanned aircraft weighing more than half a ton successfully test flight
The unmanned aircraft of Elroy Air weighs up to 551 kg. During a test flight, it reached a height of 3 m, hovered for 64 seconds and then landed successfully.Video: Amazon's drones take goods from warehouses and obstacles to deliver to customers
Amazon recently revealed more details about its delivery drone project.
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If the sea suddenly disappears, why do hundreds of millions of people have to urgently evacuate?
Why can't humans feel the temperature inside the Earth when it's 6,000 degrees Celsius?
What is the difference between Western eunuchs and Chinese eunuchs?
Secret documents reveal 'unexplained' discovery about Egyptian pyramids
Mothman: Urban Legend or Unknown Creature?
Scientists plan to bring back the Dodo bird, but how exactly will they do it?
How long does it take to reach another star system besides the Solar System?
Finding the origin of 'alien spy ship'
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