Unit One 1
What Is REM(Rapid Eye Movement)Sleep? 1
Milk—An Ancient Food in Modern Forms 4
California's Giants 8
Remembering and Forgetting 11
Unit Two 28
Why Do We Wear Clothes? 28
The Long and Short of It 30
The Cowboy's Bandanna 32
Why Study Maths? 34
Unit Three 46
Origin of Language 46
Alfred Nobel—A Man of Contrasts 47
Johnny Red and Billy Yank 49
Open Education 50
Unit Four 64
Why Cities Grew 64
Why Does Food Cost So Much? 64
Ability to Learn 65
Energy and Building Design 67
Unit Five 77
When Medicine Was Magic 77
Museums in the Modern World 78
Looking Ahead 80
Proverbs 81
Unit Six 89
Why Do We Do Anything? 89
Dewey Deeimal Classification and The Library of Congress Classification 90
Modern Examinations 99
Historical Time and Stages of Life 102
Unit Seven 119
Rip Van Winkle:Scene Ⅰ 119
Scene Ⅱ 123
Scene Ⅲ 125
A Question of Ethics 127
Unit Eight 143
In the Antarctic 143
The Big Wind 145
Learning by Doing 146
How Computers Are Changing Our World 149
Unit Nine 162
A Discussion(Part One) 162
(Part Two) 165
To Smoke or Not to Smoke 166
The Space Program:Is It Worth It? 167
Unit Ten 176
"Books,Plays and Films Should be Censored" 176
Should Women Return to Their Kitchen? 177
Education Today 178
Flats Versus Houses 179