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Life's Edge: The Search for What It Means to Be Alive

by Carl Zimmer

Where does life begin—and end?

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Awards & Recognition

  • Award recognition

    Finalist for the PEN/E.O. Wilson Literary Science Writing Award

    Named a finalist for the award.

  • Editorial selection

    A New York Times Notable Book of 2021

    Named a New York Times Notable Book of 2021.

AlbakiReads Editorial

Where does life begin—and end?

Carl Zimmer examines why defining life remains difficult even as biology and chemistry reveal new forms and behaviors. The book moves among questions raised by viruses, protocells, brains, fertilized eggs, and legal death, alongside laboratory efforts to recreate or engineer living systems. Its examples range from historical ideas about radium and Frankenstein’s monster to researchers’ experiments and Zimmer’s own attempt to evolve life in a test tube. Together, these strands connect scientific classification with practical and ethical questions: what counts as alive, and how might we recognize life beyond Earth?

Good fit for readers who enjoy

  • For readers interested in biology, scientific discovery, and the diversity of living systems.
  • For those curious about how scientific definitions intersect with ethical and legal questions.
  • For readers interested in laboratory experiments and the search for extraterrestrial life.

Themes

Defining lifeBiological diversityOrigins and artificial creation of lifeScience and ethical questionsSearching for life beyond Earth

Based on publisher information and book metadata.

Book overview

FINALIST FOR THE PEN/E.O. WILSON LITERARY SCIENCE WRITING AWARD***A NEW YORK TIMES NOTABLE BOOK OF 2021***A SCIENCE NEWS FAVORITE BOOK OF 2021***A SMITHSONIAN TOP TEN SCIENCE BOOK OF 2021

"Stories that both dazzle and edify... This book is not just about life, but about discovery itself." --Siddhartha Mukherjee, New York Times Book Review

We all assume we know what life is, but the more scientists learn about the living world--from protocells to brains, from zygotes to pandemic viruses--the harder they find it is to locate life's edge.

Carl Zimmer investigates one of the biggest questions of all: What is life? The answer seems obvious until you try to seriously answer it. Is the apple sitting on your kitchen counter alive, or is only the apple tree it came from deserving of the word? If we can't answer that question here on earth, how will we know when and if we discover alien life on other worlds? The question hangs over some of society's most charged conflicts--whether a fertilized egg is a living person, for example, and when we ought to declare a person legally dead.

Life's Edge is an utterly fascinating investigation that no one but one of the most celebrated science writers of our generation could craft. Zimmer journeys through the strange experiments that have attempted to re-create life. Literally hundreds of definitions of what that should look like now exist, but none has yet emerged as an obvious winner. Lists of what living things have in common do not add up to a theory of life. It's never clear why some items on the list are essential and others not. Coronaviruses have altered the course of history, and yet many scientists maintain they are not alive. Chemists are creating droplets that can swarm, sense their environment, and multiply. Have they made life in the lab?

Whether he is handling pythons in Alabama or searching for hibernating bats in the Adirondacks, Zimmer revels in astounding examples of life at its most bizarre. He tries his own hand at evolving life in a test tube with unnerving results. Charting the obsession with Dr. Frankenstein's monster and how the world briefly believed radium was the source of all life, Zimmer leads us all the way into the labs and minds of researchers engineering life from scratch.
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