Engineers create reverse filter, a self-healing membrane that blocks small particles but lets large ones through. Medical tools could be by sterilized by passing through the filter, or open wounds and surgical entry points could be covered with the filter to prevent contamination and infection.

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Engineers create reverse filter, a self-healing membrane that blocks small particles but lets large ones through. Medical tools could be by sterilized by passing through the filter, or open wounds and surgical entry points could be covered with the filter to prevent contamination and infection.