- Of all the oxygen that a human breathes, only twenty percent goes to the brain.
- From the age of thirty, humans gradually begin to shrink in size.
- Gases that build up in your large intestine cause flatulence. It usually takes about 30 to 45 minutes for these gases to pass through your system.
- Hair and fingernails are both made from the same substance, keratin.
- Humans inhale and exhale approximately one liter of air in ten seconds.
