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当科学开始研究非物质现象的那一天,它将在十年内取得比过去所有世纪更多的进步。
It is always good to have a problem that you cannot solve. It means you have something to work on.
Freedom of speech is the great bulwark of liberty; they prosper and die together.
The way positive reinforcement is carried out is more important than the amount.