Contents 1
1．On Friendship 1
2．Keeping Food on the Table 24
3．Dumb Kid 46
4．There’s No Way to Go But Ahead 71
5．Three Days to See 96
6．The Pursuit of Happiness 120
7．A Scientist Looks at Tomorrow 141
8．Curiosity—A Kind of Thinking 160
9．Fear—The Great Enemy 183
10．A Key to the Universe 206
11．Work 229
12．I have a Dream 249
13．Referee：Roughest Role in Sports 275
14．NASA：Space Concierge 298
15．Grant and Lee：A Study in Contrast 318
16．The Culture of Businessman 341
17．Man’s Fourth Adjustment 368
18．Knowledge and Wisdom 391
19．The Nature of Liberty 414
20．The Wild Freedom of the Mountain Men 443