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Quantum Entanglement

Ever heard about teleportation? Well, this "spooky" theory of quantum physics when proved true will help in teleportation in reality. So, what's it? 2 entangled particles will always physically interact with each other irrespective of the distance between them. So, when do entangled particles form? It's better to understand it with an example:  A laser beam fired through a certain type of crystal can cause individual photons to be split into pairs of  entangled  photons. Isn't the theory weird? Its actually proved too! More info to be provided in the next article.
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When work done is positive and when work done is negative- A classic example: An IC engine is an example of a work performing device. It takes energy in the form of chemical from the air and fuel, then converted into heat, and due to the crank piston connecting rod setup ,it moves, the crankshaft now rotates and gives power to the concerned load. Hence work done is positive. Whereas, a compressor is a work taking device. The crankshaft is rotated due to some power given to it and it sucks in air. 
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