answer: #Person1# says there are 206 bones in the human body and they count for up to 20% of the body's weight. #Person1# talks about bones' functions and the way to keep them healthy.
documents: #Person1#: Do you know how many bones there are in the human body?
  #Person2#: About 100 bones.
  #Person1#: No, there are actually 206 bones.
  #Person2#: How much do they weigh?
  #Person1#: They count for up to 20% of the body's weight. If you didn't have any bones in your body, you would look like a balloon without any air in it. Do you know what bones are for?
  #Person2#: I think bones give us the ability to stand, walk and run.
  #Person1#: Great. Actually, they have 2 important functions. One is to provide a structure that enables humans to stand upright instead of moving along the ground. The other is to protect the inside of the body. So, how can you keep your bones healthy?
  #Person2#: By eating certain foods that are good for bones.
  #Person1#: Exactly .Foods such as milk, cheese and green vegetables are helpful. Also, you need regular exercise such as dancing, walking and weight lifting. Exercise makes your bones strong. A lack of exercise weakens your muscles and bones.