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*:: [http://www.youtube.com/watch?v=UpSMNYTVqQI&feature=related 3-2-1 angles]
*: gimbal lock
*:: [http://www.youtube.com/watch?v=rrUCBOlJdt4&feature=related StephenSeefeld.net]
*: complex numbers
*:: solution of cubic equations 16th century