1. The outer covering of your teeth is enamel. Enamel is the hardest substance in the human body.
2. An oyster can change from male to female or the other way round.
3. The palms of your hand and the soles of your feet can’t become dark or grow hair.
4. One of the most dangerous insects in the world is the common housefly. They carry and spread more diseases than any other animals in the world.
5. The word “Spain” means “the land of rabbits”.
6. Fish hear through their bodies.
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