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  1. Humans

    From the March 23, 1935, issue

    Darwin's favorite plant is re-studied, rare hydrogen isotope is extracted from water, and need for strong lighting is questioned.

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  2. Babies Learn to Save Face: Infants get prepped to perceive

    A minimal amount of parent-directed training at home allows babies to sustain facial-discrimination skills that they would otherwise lose by age 9 months.

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  3. Animals

    Big Mimics: African elephants can learn to copy sounds

    Two captive African elephants—one rumbling like a truck and the other chirping like a different elephant species—show they may be the first land mammals other than primates to learn vocal imitations.

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  4. Tug-of-War: How bacteria prevent host-cell suicide

    New research suggests that bacteria may keep the cells they infect alive longer by tugging on the cells' membranes.