10 facts about sharks:
1. Great white sharks grow about 10 inches per year. Great whites can grow to mature lengths of 12 to 14 feet.
2. New teeth are constantly being formed in rows in a shark's jaw. Shark's teeth are normally replaced every eight days.
3.Some species of sharks can shed as many as 30,000 teeth in their lifetime.
4. Whale sharks have approximately 300 rows of teeth, with hundreds of tiny teeth in each row.
5. Dried shark skin (shagreen) was used in the past as sandpaper. In Germany and Japan, shark skin was used on sword handles for a non-slip grip.
6. In 1937, shark liver oil was discovered to be rich in vitamin A. Sharks were hunted for the vitamin until 1950, when a synthesizing method was developed for vitamin A.
7. The average life span of a shark is 25 years, but some sharks can live to be 100.
8. The dogfish sharks are named for their tendency to attack their prey as a pack of wild dogs would.
9. Great white sharks can go as long as three months without eating.
10. Not all sharks have to be in continuous motion to breathe.
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