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  1. Tech

    Tiny device brings out the best in sperm

    A new device with potential use in fertility treatments separates robust sperm from stragglers by exploiting a phenomenon that occurs when two microscale fluid flows merge.

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  2. Earth

    Satellites unravel a spot of mystery

    Five satellites that happened to be in the right places at the right time may have confirmed the cause of proton auroral spots, aurora-like phenomena that appear high in Earth's atmosphere.

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  3. Toddlers ride rail to tool use

    Toddlers' ability to modify their use of a handrail as they walk across a narrow bridge represents an early example of tool use, according to two psychologists.