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valerie taylor on 14 Jul 11The Science of Air: Video Demonstrations Air is all around us, and it's essential for life on Earth, but most people rarely give it a thought. Maybe because we can't see it, we take air for granted. But the 20,000 breaths the average person takes every day would be impossible without air. How do we even know it's there? What is it made of? How does it affect us, and why do we need it?