Where Hearts And Minds Collide

14. The Common Enemy

15. Abortion: Is It Possible to Be Both "Pro-Life" and "Pro-Choice"? (cowritten with Ann Druyan)

16. The Rules of the Game

17. Gettysburg and Now (cowritten with Ann Druyan)

18. The Twentieth Century

19. In the Valley of the Shadow Epilogue by Ann Druyan Acknowledgments References

Index

List of Illustrations

Photograph of Carl Sagan with Johnny Carson on the Tonight show, May 30, 1980

Counting big numbers—six sketches by Patrick McDonnell

The Grand Vizier's reward—three sketches by Patrick McDonnell

Exponential growth in bacterial population, showing the flattening of the curve

Exponential growth in human population, showing the flattening of the curve

Ripples in water on the surface of a lake, showing the wave pattern 40 The electromagnetic wave spectrum—note the small portion that we experience as visible light

Surface-reflectance properties of ordinary pigments in visible light. .52 Carbon dioxide concentrations in

Earth's atmosphere over time . .127 Timeline of global temperatures

Greenhouse Warming—sketch by Patrick McDonnell

Nuclear Power—sketch by Patrick McDonnell xii • List of Illustrations

Solar Energy—sketch by Patrick McDonnell

Human fetal development—drawings showing fetus at conception and at three weeks

Human fetal development—drawings showing fetus at five weeks and at sixteen weeks

Human fetal development—drawings showing resemblance of a human fetus to, in succession, a worm, an amphibian, a reptile, and a primate

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