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Tuesday, March 31, 2015

Sunday, March 29, 2015

Saturday, March 28, 2015

South Facing Dragon


This is a model of a 2,000 year old military weapon. The Chinese invented the differential gear so their "dragon" always faced in the same direction no matter how the cart was twisted and turned. The military advantage was that in the heat, confusion, and dust of battle the generals could always tell what direction they wanted to advance. 

Monday, March 23, 2015

Sunday, March 22, 2015

Saturday, March 21, 2015

Friday, March 20, 2015

Thursday, March 19, 2015

Monday, March 16, 2015

Saturday, March 14, 2015

Friday, March 13, 2015

Wednesday, March 11, 2015

Tuesday, March 10, 2015

Saturday, March 7, 2015

Wednesday, March 4, 2015

Tuesday, March 3, 2015