- The hardest substance in the human body is enamel.
- Useful life of a modern toilet is 50 years.
- An arrow frog has enough poison to kill over 2,200 people.
- Each time you see a full moon you always see the same side.
- Each red blood cell lives an average of 4 months and travels between the lungs and other tissue 75,000 times before returning to bone marrow to die.
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