After breathing a deep sigh, I feel better -- don't you? It's relaxing. And it turns out there's a good reason why we feel relief after big breaths. It comes down to a special fluid inside our lungs. The liquid -- pulmonary surfactant -- helps our lungs work. Without it, we'd be in serious trouble. But researchers at ETH Zurich , a university in Switzerland, found that deep breaths have an interesting effect on how this fluid interacts with the lungs. The new research was published in the journal Science Advances and could have meaningful implications for future medicine and therapies.

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'Magic' lung fluid to the rescue

For a long time, scientists have been interested in ho

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