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What does that suggest when a compound this simple plays such an important role? To me it suggests that nitric oxide is one of the most primitive elements of cellular signaling, that it goes way back into evolution.

There are very few things in the body that nitric oxide doesn't regulate.

Nitric oxide is a key biological messenger within the body. When released by the cells lining your arteries, it makes the walls of the arteries relax, allowing more blood to flow.

Nitric oxide was known for destroying things.

Physiology has, at last, gained control over the nerves which stimulate the gastric glands and the pancreas.

Breath does, in fact, connect us all in a very literal way. Take a breath now. And as you breathe, think about what is in your breath. There perhaps is the CO2 from the person sitting next-door to you.

Modern life would not be possible if it were not for chemicals, nor would modern natural gas production.

Activating oxygen can produce compounds called radicals that put oxidative stress on cells. Such stress could ultimately lead to cancer and other diseases.

We don't invent our natures. They're issued to us along with our lungs, our pancreas and everything else.

I have never met a geologist or leading scientist who believes adding more carbon dioxide to the atmosphere will have any significant effect on climate change.