Grand Coulee Dam.  Air-conditioning.   Hoover Dam.  Empire State Building.  Over 3 million miles of highway.  Golden Gate Bridge.  Verrazano Bridge.  Holland Tunnel.  George Washington Bridge.  Automatic transmissions.  Commercial jet travel. Electric refrigerators.  That and more took place 1900-1960.   Since then…?  Almost nothing!  What! Why?
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