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  1. Paleontology

    Frozen rainforest

    Fossils trapped in amber provide evidence that the Amazonian rainforest dates back 10 to 15 million years.

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  2. Earth

    When a Shot Is Not: PCBs may impair vaccine-induced immunity

    Exposure to certain pollutants early in life may do lasting harm to the immune system by blocking its response to vaccinations.

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  3. Moss Express: Insects and mites tote mosses’ sperm

    A lab test has shown that mosses have their own version animal-courier system for sperm that's similar to pollination.

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  4. Tech

    Wheel of Life: Bacteria provide horsepower for tiny motor

    Crawling bacteria can power a micromotor.