A random topic

• With six and a half tons per square inch of biting force, sharks have the strongest jaws in the world. They can bite with both their upper and lower jaw.
  
• If a shark looses a tooth, another tooth rotates forward from its rows of spare teeth.Whale sharks have approximately 300 rows of spare teeth, with hundreds of teeth in each row.
  
• In its life, a shark can use over 20,000 teeth. on average, their teeth are replaced every eight days
  
• Dried shark skin used to be used as sandpaper and non-slip grips on sword handles.
  
• In the uterus, shark embryos eat their siblings.
• One out of every 30 million people is attacked by a shark
  

Source. Source. Source.