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  1. Archaeology

    Stone tools put early hominids in China 2.1 million years ago

    Newly discovered stone tools in China suggest hominids left Africa 250,000 years earlier than we thought.

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  2. Ecosystems

    Bird poop helps keep coral reefs healthy, but rats are messing that up

    Eradicating invasive rats from islands may help boost numbers of seabirds, whose droppings provide nutrients to nearby coral reefs.

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  3. Particle Physics

    Readers ask about proton pressure, wearable tech and more

    Readers had questions about the pressure inside a proton, wearable tech safety and the effects of global warming on insects.

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  4. Science & Society

    In research, detours are a key part of discovery

    Editor in Chief Nancy Shute discusses the scientific process and the often contradictory research about Alzheimer's disease.