Imagine if all the Earth’s oxygen disappeared. Not forever, just for, say, an hour? Could you hold your breath that long?

As a lifelong health and fitness enthusiast with 15 years of experience, Rachel MacPherson is passionate about cutting through fads and noise. Her aim is to clearly communicate health information with ...

Sandra Gordon is a journalist specializing in health and medicine for consumers and healthcare providers. Her work has appeared in major magazines and websites, including Prevention, Parents, Medical ...