但去年夏天，乔安娜和亨利注意到，他们的大儿子有个改变：突然，相对于与父母交流，它更多的是与朋友交流。
But last summer, Joanna and Henry noticed a change in their older son: suddenly he seemed to be talking far more to his friends than to his parents.
一个世纪前，亨利·卡文迪什注意到当空气中的氧气和氮气被除去，还有其他剩余气体存在，但人们还没有认识到它们的重要性。
A century earlier, Henry Cavendish had noted the existence of a residual gas when oxygen and nitrogen are removed from air, but its importance had not been realized.
1892年的一个清晨，内布拉斯加州一家饭店正是提供早餐的时间，亨利·佩基律师注意到一个正在吃一满勺煮熟的小麦和牛奶。
One morning in 1892, a Nebraska hotel was serving breakfast when lawyer Henry Perky noticed a man eating a bowlful of boiled wheat and milk.
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