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  1. Animals

    Female moths join pheromone choruses

    Female rattlebox moths can detect each other's male-luring pheromones and tend to gather in what may be a scent version of male frogs' chorusing around the pond.

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  2. Drug could be depression buster

    Preliminary evidence indicates that a single dose of a drug called ketamine rapidly quells symptoms of major depression for up to 1 week in patients who don't benefit from standard antidepressant medications.

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  3. Sperm in frozen animals still viable years later

    Sperm stored inside frozen organs or whole animals can produce healthy offspring years later.

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  4. Astronomy

    Spiral galaxy in the young universe

    Astronomers have identified a galaxy that had already begun to resemble the modern Milky Way when the universe was only 3 billion years old, one-fifth of its current age.