Water is so the new Cristal. If you're Jay-Z that is.

The 36-year-old hip-hop mogul teamed with the United Nations and MTV on Wednesday to get children involved in the fight against the worldwide water crisis. "As I started looking around and looking at ways that I could become helpful, it started at the first thing -- water, something as simple as water," he said at U.N. headquarters. "It took very little, very little to see these numbers."

U.N. Secretary-General Kofi Annan met with the rapper and recalled President Kennedy's remarks that anyone who solved the world's water problems deserved Nobel prizes for peace and science. "Together, we may yet inspire a young viewer to take up President Kennedy's challenge, and claim both those Nobel Prizes," Annan said.

MTV will document Jay's benevolent tour, which begins Sept. 9.

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