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  1. Humans

    From the April 14, 1934, issue

    Yawning spells, disagreeable alcohols from anaerobic respiration, and how antibodies protect adults from disease.

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  2. Chemistry

    Materials Factory: RNA manufactures palladium particles

    Chemists have evolved RNA fragments in the lab that spontaneously synthesize highly uniform, hexagonal-shaped nanoparticles of palladium.

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  3. Health & Medicine

    Categorizing Cancers: Gene activity predicts leukemia outcome

    By dividing acute myeloid leukemia into subtypes on the basis of which genes are abnormally active in a given patient, doctors may be able to predict outcomes and make better treatment decisions.

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  4. Fat Chance: Hormone boosts metabolic rate, induces weight loss in mice

    Fat cells secrete a hormone that tells the brain to boost the body's metabolic rate.