Physics
Nuclear reactors used to produce electricity are based on

Nuclear fusion
Cold fusion
Nuclear fission
Superconductivity

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Physics
A cyclist leans inwards when he is negotiating a curve so that

No frictional force may be produced between the wheels and the axle
Necessary centripetal force may be available from the horizontal component of the normal reaction due to the track to maintain the curved motion.
He may increase his speed
His weight may be reduced

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