There are 118 elements on the period i c table, and you might think we are made up of many of them. But that's not the case; the complex systems that make up our bodies have a surprisingly simple ...

When a person is at rest, meditating or reading a book, the parasympathetic nervous system is at work. Also known as the "rest and digest" system, the parasympathetic nervous system is responsible for ...

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Most of us never get to see the inner workings of our bodies. Sometimes we get tiny glimpses when our bodily fluids make an appearance in the outside world—like a runny nose, a bleeding paper cut. But ...