1. Noura Khalid AL-Qarni

2. Tears

3. Tears are an important protection and lubricant for the eye
Tears are an important protection and lubricant for the eye. They can flush out irritants and keep the eye wet to enhance vision.

4. When we cry?

5. Crying is a mystery.

6. What is the true explanation for our tears?
What are tears?
How do they come?
Why do they come?

7. FACTS ABOUT TEARS Tears have salt. There are two kinds of tears:
Emotional tears.
Reflex tears.

8. Emotional Tears

9. Reflex tears

10. William Frey, a scientist who is studying the chemistry of tears, said that there is more protein in emotional tears than in reflex tears ones, but nobody knows why there is that extra protein, and nobody knows where it comes from .. .

11. WOMEN CRY MORE OFTEN THAN MEN

12. THEORY OF FREY
stress and pressure produce poison chemicals in the body. Crying is people's way to remove these poison chemicals out of the body ..

13. IN THE END Psychologists also believe that crying help us .
For our health, it may be good for all of us, men and women, to have a good cry more often

15. THAK YOU

16. REFERENCES http://ask.yahoo.com/20030313.html