We think of oxygen as life, sustenance, a literal breath of fresh air. But it's actually a very reactive element. Anyone who's burned a log has witnessed this firsthand. So why do so many life-forms ...

You need to breathe for the same reason you need to eat: It helps you make the energy your body requires. You probably already know that food is fuel for your body. When you eat, food gets broken down ...

There's nothing like hearing your pilot say "Ladies and gentlemen we've reached our cruising altitude of 37,000 feet. Feel free to move about the cabin but please keep your seatbelt on when you're in ...

Christina S. Baer does not work for, consult, own shares in or receive funding from any company or organization that would benefit from this article, and has disclosed no relevant affiliations beyond ...