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Learning any new skill, like walking and talking, requires children to encode, store and retrieve memories effectively. Lots of practise and sleep helps these skills become automatic and effortless...Please note - there is no sound or speech in this video.

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...centre of a lens do not deviate from their original path. Light paths do not depend on the direction in which light is travelling. So, for example, since parallel rays of light are brought to a focus by a convex lens at a distance f from the lens, then rays of light emanating from a point a distance f away from the lens will be converted into a parallel beam. A lens which...