1. We breathe 13 pints of air every minute.

2. Each lung contains 300-350 million respiratory units called alveoli making it a total of 700 million in both lungs.

3. More than half a liter of water per day is lost through breathing.

4. People under 30 years of age take in double the amount of oxygen in comparison to a 80 year old.

5. Yawning brings more oxygen to the lungs.