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  1. Animals

    Each year painted lady butterflies cross the Sahara — and then go back again

    Painted ladies migrate the farthest of any butterfly.

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  2. Tech

    With this new system, robots can ‘read’ your mind

    Giving robots instructions via brain waves and hand gestures could help the machines operate more safely and efficiently.

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  3. Physics

    To combat an expanding universe, aliens could hoard stars

    An advanced alien civilization might combat the impact of dark energy by harvesting stars.

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  4. Astronomy

    On Jupiter, lightning flashes from storms swirling at the poles

    After almost 40 years, scientists have discovered that Jupiter has lightning that is similar to lightning on Earth — it just happens in a different place.