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    Short WaveMirror cells could threaten life on Earth. Why are we building them?
    14 min

    Mirror cells could threaten life on Earth. Why are we building them?

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    For people with two hands, one is usually dominant. On a molecular level, earthly life takes this to the extreme. All of the DNA in living things twists to the right, whereas the protein building blocks favor a kind of left-handed chemistry.

    The rules of life are based on this chemistry.

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    © NPRLength 14 min10 August 2026ScienceFactsEducationalUSAEpisodic

    Introducing Short Wave

    Introducing Short Wave

    This is an episodic podcast, so you can listen to it in any order, but episode one is a great place to start.

    Listen to episode one here
    11+ScienceFactsEducationalUSAEpisodic10 August 2026© NPR

    For people with two hands, one is usually dominant. On a molecular level, earthly life takes this to the extreme. All of the DNA in living things twists to the right, whereas the protein building blocks favor a kind of left-handed chemistry.

    The rules of life are based on this chemistry.

    In recent years, scientists have worked toward a kind of mirror version of life. Currently, the technology doesn't exist to make mirror life at the cellular level — and likely won't for at least a decade. Still, a group of scientists is concerned enough about the possibility that they've published a 299-page technical report calling for a stop to the science.

    In this encore episode for our Tech Camp series, host Regina Barber talks to Carl Zimmer, a science reporter at The New York Times, about his reporting on mirror cells — and why creating them could lead to devastating consequences for life on Earth.

    Check out Carl's full article.

    Curious about other controversial research? Email us at shortwave@npr.org.

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