Can u able to guess the september 30?

September 25, 2007 7:29am CST
Can u guess what is the specialty of September 30? I can give here one clue that is is relate with our body especially without that one we can't live. What is that one? Also maintain and take care on that part or organ of our body. Many of us have a problem and finally affected by the severe disease that result in death. So take care of that organ?
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