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Why do men have to wait for 'round 2'?

If you type into a search engine—"why do men have to wait before having sex again?"—the results will include many references to prolactin. This hormone is thought to be involved in hundreds of physiological processes ...

NASA releases James Webb telescope 'teaser' picture

NASA has a provided a tantalizing teaser photo ahead of the highly-anticipated release next week of the first deep-space images from the James Webb Telescope—an instrument so powerful it can peer back into the origins of ...

Bacteria upcycle carbon waste into valuable chemicals

Bacteria are known for breaking down lactose to make yogurt. Now researchers led by Northwestern University and LanzaTech have harnessed bacteria to break down waste carbon dioxide (CO2) to make valuable industrial chemicals.

SpaceX SN8 to launch and fly to 60,000 feet next week

Elon Musk, head of SpaceX, has announced via Twitter that the company's SN8 rocket will take a test flight sometime next week. The plan is for the rocket is to soar up to 60,000 feet (18,300 meters) and then return to Earth ...

Scientists demonstrate quantum radar prototype

Physicists at the Institute of Science and Technology Austria (IST Austria) have invented a new radar prototype that uses quantum entanglement as a method of object detection. This successful integration of quantum mechanics ...

Engineers make critical advance in quantum computer design

Quantum engineers from UNSW Sydney have removed a major obstacle that has stood in the way of quantum computers becoming a reality. They discovered a new technique they say will be capable of controlling millions of spin ...

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Engine

An engine is a mechanical device that produces some form of output from a given input. An engine whose purpose is to produce kinetic energy output from a fuel source is called a prime mover; alternatively, a motor is a device which produces kinetic energy from other forms of energy (such as electricity, a flow of hydraulic fluid or compressed air). A motor car (automobile) has a starter motor and motors to drive pumps (fuel, power steering, etc) – but the power plant that propels the car is called an engine. The term 'motor' was originally used to distinguish the new internal combustion engine -powered vehicles from earlier vehicles powered by a steam engine (as in steam roller and motor roller).

Military engines included siege engines, large catapults, trebuchets and battering rams.

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