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'Hell hole' in Guatemala is still a mystery
Scientists have not found the culprit behind the giant pit in Guatemala's capital.
Volcanoes in Iceland wake up after 200 years
A volcano in southern Iceland operated after nearly two centuries of quiet sleep, blowing dust and towering lava columns.
Robot replaced the surgeon
US scientists have invented a type of 'robot doctor' that can perform conventional surgical operations without the need for human intervention.
Robotics do housework
The robot with the name PR2 folded the towel quite well, but it took 25 minutes to fold one.