The human body may seem like a single, self-contained system, but it actually hosts trillions of microscopic organisms. These ...

Watch a white blood cell actively searching for bacteria or viruses under the microscope. Watch: Australia's sky turns blood red, viral video sparks 'apocalyptic' fears - what's happening? Health ...

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Swallow the wrong microbe, and you might end up in the hospital with a needle or two in your arm — and plenty of itty-bitty bacterial needles poking at you from the inside. That’s because many ...