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  1. Humans

    50 years ago, folate deficiency was linked to birth defects

    50 years ago, scientists found that a lack of folic acid in pregnant women could cause birth defects. But now, how much is too much?

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  2. Science & Society

    Would you opt to see the future or decipher the past?

    Acting Editor in Chief Elizabeth Quill wonders what it would be like if scientists could see into the past and the future.

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  3. Life

    Readers debate ethics of resurrecting extinct species

    Readers raised questions about using gene editing tools to bring species back from the dead.

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  4. Neuroscience

    Scientists are seeking new strategies to fight multiple sclerosis

    Facing so many unknowns about multiple sclerosis, researchers explore the immune system, the neurons and the gut to fight the disease.