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Eventhough there is no known physical benefit from swimming with dolphins, the effect it has on a sick child's mental state is another story: dolphins can make young cancer patients smile. And, as any parent will tell you, there's no way to measure how valuable that can be. The Early Show's Tracy Smith reports.

For most of the past year, this has been Mark Perez's life: a world of constant check-ups and never-ending needles.

At age 8, mark has all but beaten bone cancer.

About Mark, Dr. Athena Pefkarou says, "He's a very well behaved little boy, a very brave little boy who has gone through chemotherapy and two surgeries."

Mark's mom explains, "They removed the bone and he has metal now. He thinks he's the bionic man."

Tune in Friday morning to get the complete "Study Hall" report.


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