By Richard Feynman
On his blackboard at time of death in 1988. (Ref.)
共勉之:)
2010年10月1日 星期五
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By Richard Feynman
On his blackboard at time of death in 1988. (Ref.)
共勉之:)
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By Richard Feynman
On his blackboard at time of death in 1988. (Ref.)
共勉之:)
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