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Shea Walsh, Associated Press
Matthew McConaughey says he and his girlfriend, Camila Alves, have enjoyed integrating their<BR> new baby, Levi, into their lives.

Matthew McConaughey says the birth of his son will help bring a little joy to others in the world someday.

The actor kept the placenta from the July birth of his son and plans to plant it in an orchard, he tells CNN's "House Call with Dr. Sanjay Gupta" in an interview from New York scheduled to air in two parts tonight and Aug. 16.

McConaughey says he hopes it will fertilize the land, a ritual long followed in several cultures.

McConaughey also says he and his girlfriend, Camila Alves, have enjoyed integrating their new baby, Levi Alves McConaughey, into their lives. Already they've started introducing him to the "sights and the sounds" of the world — including a John Mellencamp concert.