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  1. Humans

    From the January 1, 1938, issue

    Giant electric machines in the works, a mysterious new subatomic particle, and seeking the age of an isthmus.

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  2. Health & Medicine

    Addiction Alleviator? Hallucinogen’s popularity grows

    The unsanctioned use of an obscure hallucinogen, ibogaine, to treat addiction has exploded recently.

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  3. Reading the Repeats: Cells transcribe telomere DNA

    Scientists have discovered that human cells make RNA transcripts of telomeres, the repetitive DNA at the ends of chromosomes, a finding that could have implications for understanding aging and cancer.

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  4. Paleontology

    Whales started small

    The ancestors of whales, some of which are the largest creatures ever to evolve, probably were mammals no larger than a fox.