Did you know

1. Did you know that the average person spends about 1 year of their life waiting in lines?
2. Did you know that the surface area of your lungs is about the same size as a tennis court?
3. Did you know that the human body can produce enough saliva to fill an Olympic-sized swimming pool in a lifetime?
4. Did you know that the speed of light is about 670 million miles per hour?
5. Did you know that the population of the earth is about 8 billion people?