巴斯德说过:“机遇总是偏爱有准备的头脑。”翻开科学史,我们会发现,许多科学家在科学发明历程中走了九十九步,最后离成功只差一步时,却永远失去了发明的机会。回顾这些事件,我们除了遗憾之外,也许会得到更多的启迪。当年卡文迪许再多走半步,惰性气体的发现会早100年法国科学家拉瓦锡提出空气中除少量水分和二氧化碳之外,氧气占1/5,氮气占4/5。卡文迪许 Pasteur said: “Opportunities always favor prepared minds.” Turning to the history of science, we find that many scientists walk ninety-nine steps in the course of their invention of science and last forever Lost the chance of invention. Recalling these events, we may get more enlightenment than just regret. In the same year, Cavendish allowed another halfway to go. The discovery of inert gas would be 100 years as early as possible. The French scientist Lavoisier proposed that in addition to a small amount of water and carbon dioxide in the air, oxygen accounts for 1/5 and nitrogen accounts for 4/5. Cavendish