don't miss this video Relaxation slows your heart rate
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The fate of northern Krakatoa has been the subject of some dispute among geologists. It was originally proposed that the island had be...
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Trains actually don't make that sound. The rails make it. A rail is not a single metal piece but a series of rail pieces with ce...
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more details about rail track Railroad tracks used to be joined with fish plates, metal gussets bolted across the sides of the joints ...
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