The Harvard fly is not the first tiny flying robot, but it may be the tiniest. A team at KMel Robotics has built drones that are about six inches across, have rotors instead of wings, and can fly autonomously in swarms. Aerovironment’s Nano Hummingbird has flapping wings, as its name suggests, that span just 6.5 inches.
You would think that if a helicopter lost all power that it would crash to the ground. But no there is a maneuver that helicopter pilots use called auto rotation that allows the pilot to safely land on the ground with out power.
These flying quadrotors are completely autonomous, meaning humans are not controlling them; rather they are controlled by a computer programed with instructions to play the instruments.
Tiger-Stone is a Dutch made paving machine that uses gravity and an electric motor to print stone and brick roads. It’s a six meter wide machine that is capable of laying 300 square meters of road a day. The printing width is adjustable from the width of a road to as narrow as a bike lane or walkway. There are no moving parts within the machine, it simply uses a shelf that is fed bricks and they are automatically sorted and packed together by gravity, each stone will associate with the link previously made. There is a quiet electric motor that moves the machine along a bed of sand creating consistent results with a simply operated paver.