Popular Science
(For the most part aimed at those with little or no science background)

"Our species needs,
and deserves,
a citizenry with minds
wide awake
and a basic understanding
of how the world works."

-- Carl Sagan (from The Demon-Haunted World)

The Alex Studies by Irene Maxine Pepperberg
Aliens: Can We Make Contact with Extraterrestrial Intelligence? by Andrew J. & David H. Clark
The Ascent of Science by Brian Silver

The Beak of the Finch: A Story of Evolution in Our Time by Jonathan Weiner
Before The Beginning: Our Universe and Others by Martin Rees
The Best American Science and Nature Writing 2003 by Richard Dawkins (editor)
The Bible According to Einstein
Billions and Billions by Carl Sagan
Blind Watchers of the Sky by Rocky Kolb
Body Heat: Temperature and Life on Earth by Mark S. Blumberg
Bonobo: The Forgotten Ape by Frans de Waal
The Book of the Cosmos edited by Dennis Danielson
Brain Waves Through Time by Robert T. DeMoss
A Brief History of Time by Stephen Hawking

Carl Sagan by William Poundstone
Carl Sagan's Universe
Children of Prometheus by Christopher Wills
Children of the Ice Age by Steven M. Stanley
Civilization and the Limpet by Martin Wells
Contact (fiction) by Carl Sagan
Conversations with Neil's Brain by William Calvin
The Creative Loop: How the Brain Makes a Mind by Erich Harth

Darwin's Dreampond by Tijs Goldschmidt
Darwin for Beginners by Jonathan Miller & Borin Van Loon
Darwin by Adrian Desmond & James Moore
The Demon-Haunted World: Science as a Candle in the Dark by Carl Sagan
A Devil's Chaplain: Reflections on Hope, Lies, Science, and Love by Richard Dawkins
Dinosaur in a Haystack by Stephen Jay Gould
Doubt and Certainty by Tony Rothman & George Sudarshan

The Earwig's Tail by May R. Berenbaum
Einstein for Beginners by Joseph Schwartz & Michael McGuinness
Einstein, History, and Other Passions by Gerald Holton
Enough: Staying Human in an Engineered Age by Bill McKibben
Evolution and the Myth of Creationism by Tim Berra

Fantastic Voyage: The Science Behind Radical Life Extension by Ray Kurzweil and Terry Grossman
Fire on Earth by John & Mary Gribbin
The First Fossil Hunters: Paleontology in Greek and Roman Times by Adrienne Mayor
Flim-Flam! Psychics, ESP, Unicorns, and other Delusions by James Randi
A Fly for the Prosecution: How Insect Evidence Helps Solve Crimes by M. Lee Goff
As the Future Catches You by Juan Enriquez

Galileo's Daughter: A Historical Memoir of Science, Faith, and Love by Dava Sobel
The Great Beyond: Higher Dimensions, Parallel Universes and the Extraordinary Search for a Theory of Everything by Paul Halpern
The Greatest Experiment Ever Performed on Women: Exploding the Estrogen Myth by Barbara Seaman
Great Feuds in Science: Ten of the Liveliest Disputes Ever by Hal Hellman
Greenhouse: The 200-Year Story of Global Warming by Gale E. Christianson

How Things Are: A Science Tool-Kit for the Mind
Huxley: From Devil's Disciple to Evolution's High Priest by Adrian Desmond

[an error occurred while processing this directive] The Impact of the Gene: From Mendel's Peas to Designer Babies by Colin Tudge
Insisting on the Impossible: The Life of Edwin Land by Victor McElheny
Isaac Newton by Michael White

Life by Richard Fortey
Life's Matrix: A Biography of Water by Philip Ball

The Making of the Atomic Bomb by Richard Rhodes
Making Babies: The Science of Pregnancy by David Bainbridge
Mean Genes by Jay Phelan & Terry Burnham
Measuring the Universe: Our Historic Quest to Chart the Horizons of Space and Time by Kitty Ferguson
The Meaning of It All: Thoughts of a Citizen Scientist by Richard Feynman
The Medici Effect: Breakthrough Insights at the Intersection of Ideas, Concepts, and Cultures by Frans Johansson
The Misunderstood Gene by Michel Morange
The Molecule Hunt: Archaeology and the Search for Ancient DNA by Martin Jones

Next of Kin: What Chimpanzees Tell Us about Who We Are by Roger Fouts

On Intelligence by Jeff Hawkins
Origins Reconsidered by Richard Leakey

Patterns in Evolution : The New Molecular View by Roger Lewin
Patterns in the Sand: Computers, Complexity, and Everyday Life by Terry Bossomaier & David Green
The Pony Fish's Glow: And Other Clues to Plan and Purpose in Nature by George Williams
The Practical Archaeologist: How We Know What We Know About the Past by Jane McIntosh
The Predictors: How A Band of Maverick Physicists Used Chaos Theory to Trade Their Way to a Fortune on Wall Street by Thomas Bass

A Rum Affair: A True Story of Botanical Fraud by Karl Sabbagh

"There are many hypotheses
in science which are wrong.
That's perfectly all right;
they're the aperture
to finding out what's right.
Science is a self-correcting process.
To be accepted,
new ideas must survive
the most rigorous standards
of evidence and scrutiny."
-- Carl Sagan
The Sacred Balance: Rediscovering Our Place in Nature by David Suzuki
Science As a Way of Knowing: The Foundations of Modern Biology by John A. Moore
Shadows of Forgotten Ancestors by Carl Sagan
Skywatching by David Levy
Song for the Blue Ocean by Carl Safina
Surely You're Joking, Mr. Feynman! by Richard Feynman
Sync: The Emerging Science of Spontaneous Order by Steven Strogatz

Time Traveler by Michael J. Novacek
Trace Your Roots with DNA: Using Genetic Tests to Explore Your Family Tree by Megan Smolenyak

Ultimate Fitness: The Quest for Truth about Health and Exercise by Gina Kolata
Unweaving the Rainbow by Richard Dawkins

Venus Revealed by David Grinspoon

The Way Life Works by Mahlon Hoagland
Worlds Without End by John S. Lewis
Why People Believe Weird Things by Michael Shermer

Also see Helping Your Child Learn Science
(Adults will probably learn from from this link too!)