Tuatara

Tuataras cannot replace their teeth.

  A tuatara's teeth are connected to its jawbone and when lost, cannot be replaced. As a tuatara gets older, it has to eat softer food like earthworms and slugs.  
Aztec Slave

Aztec slaves could have their own slaves.

  In the Aztec empire, slaves were treated well. They could have their own possessions and their own slaves. They could also marry their masters or buy their freedom. Their...
Isinglass

A substance from fish bladder is used to make wine and beer.

  Isinglass is a substance found in the swim bladders of fish and once dried, it is used in the processing of wine and beer, particularly to make these beverages...
Swimming Pool

Throughout your life, you will produce enough saliva to fill two swimming pools.

  Each day, you make up to 2 liters of saliva. Saliva is important, after all. It not only helps in digestion and protects you teeth but without saliva, you...

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