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We live in a time where it is possible to speak to anyone at any time from anywhere in the world, thanks to telephones. But how do they work? Thanks to this video you won't need to wonder any more, as this explains exactly how they work as well as how the ITU helps to make sure every call goes through properly.

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Harvard Natural Sciences Lecture Demonstrations

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The sonic boom problem - Katerina Kaouri

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The Doppler Effect: what does motion do to waves?