Actually,Qian is right on both these you think is wrong.

Actually Mr. Qian probably is right,in USA,potatoes product almost reached 10000 jin one chinese ace,so he is not wrong.Many people read bible and all the presidents in USA dare not doubt the story of Jesus, and Mr. Qian just repeated the stories he read from the bible when he was in USA. So he did not make mistake, just because we, common people can not understand what he talked about.