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  1. Earth

    Ash from Icelandic eruption may just be the start

    A recently awakened volcano often goes off in tandem with a much bigger one nearby.

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  2. Space

    Famous Martian meteorite younger than thought

    The famous fragment of Mars, once proposed to hold signs of extraterrestrial life, is still pretty old. But the rock appears to have formed about 400 million years later than earlier analyses indicated.

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  3. Space

    Stormy weather on Saturn

    Astronomers have for the first time glimpsed lightning storms on Saturn.

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  4. Health & Medicine

    Embryo transfer technique could prevent maternally inherited diseases

    A new technique transplants healthy nuclear DNA of cells carrying mutated mitochondria.