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  1. Planetary Science

    Readers weigh in on human gene editing and more

    Readers debated feeling morally obligated to edit their kid's genes and had questions about exoplanets.

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  2. Health & Medicine

    50 years ago, early organ transplants brought triumph and tragedy

    In 1968, the liver transplant field had its first small successes. Now, more than 30,000 patients in the U.S. receive a donated liver each year.

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  3. Paleontology

    New fossils are redefining what makes a dinosaur

    While some researchers question what characteristics define the dinosaurs, others are uprooting the dino family tree altogether.

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  4. Astronomy

    An amateur astronomer caught a supernova explosion on camera

    An amateur astronomer has caught a supernova explosion on camera.