出处:1892年纽约芝加哥的电话线路开通。电话发明人贝尔第一个试音时的声音，这一历史性声音被记录下来。

Profitability and responsibility must go hand in hand.

The mathematician's patterns, like the painter's or the poet's, must be beautiful; the ideas, like the colors or the words, must fit together in a harmonious way.

Writing is groping in the dark, hoping to find a light.