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An electric bike that can be ridden without a person
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Swedish social robot

Specialists of the Stockholm startup Furhat Robotics have developed a social robot that can change its face.

The robot is a robotic head with a wide-angle camera, microphones and stereo speakers. Replaceable and very realistic faces allow a person to prepare for a conversation with a real interlocutor.
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Kjeragbolten is the most dangerous stone in the world. It is located in Norway, at an altitude of 1084 meters above the abyss.
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Scotland
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Zurich
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Largest bungee, New Zealand.
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A quiet mosque in Palestine, 1926
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Road located on the roof of the house
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A robot that always wins in "rock, scissors, paper."
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Just a Pendulum and Light

The light and the pendulum are a mesmerizing effect.
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Vintage aircraft: The Hoppicopter (1948)

This is the creation of designer H. Pentecost, who worked on the development of a helicopter parachute.

He mounted a 20 hp two-stroke motorcycle engine as a drive and transmitted the power to the rotor through the coaxial circle circuit.

The Hoppicopter was built in two versions: in the form of a backpack and one fitted with a tricycle landing gear.

Unfortunately, because of low power and small diameter of propellers, the design proved to be very traumatic for pilots.
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The motion of the ball in the flow is explained by Bernoulli's principle — the difference of pressures acting on the surface of the ball from different sides.
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