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  1. Archaeology

    This 1.4-million-year-old hand ax adds to Homo erectus’ known toolkit

    A newly described East African find, among the oldest bone tools found, shows the ancient hominids crafted a range of simple and more complex tools.

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  2. Genetics

    A bacterial toxin enables the first mitochondrial gene editor

    Researchers have engineered a protein from bacteria that kills other microbes to change DNA in a previously inaccessible part of the cell.

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  3. Physics

    The universe might have a fundamental clock that ticks very, very fast

    A theoretical study could help physicists searching for a theory of quantum gravity.

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  4. Health & Medicine

    These cells slow an immune response.