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Cooking With Quarks and Gluons
Extract from a presentation Clifford Johnson gave at Caltech on 17/04/08. All about promising research on string theory models of a new phase of matter.
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This is how it is ... place two pencils @ 109 degrees to each other and repeat this another 3 times so that you have 4 lots of two pencils at 109 degrees.
Put three of these pairs together with the three angles touching in the centre (3x109)
now try to place the fourth pair into the other three pair without upsetting the 360 degree circle (sphere) which the first three pair compose ... there is your answer