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Happiness ain't a thing in itself --- it's only a contrast with something that ain't pleasant. That's all it is.
The complexity of viruses reminds us how much we still have to learn about biology.
教师最重要的是一颗理解的心,它值得无限地尊崇。人们在回忆中赞赏才华横溢的教师,但感激曾触动自己的人类情感的教师。对于成长中的孩子、对于孩子的灵魂,功课是必须的,但至关重要的营养是人性的温暖。
What is the difference between a Turing machine and the modern computer? It's the same as that between Hillary's ascent of Everest and the establishment of a Hilton hotel on its peak.