Boxing legend Muhammad Ali turns 70 Tuesday, and a public celebration is underway at the Ali Center in downtown Louisville. "We have a jam-packed weeklong lineup of activities for the community, many of which are free or discounted," said center spokeswoman Jeanie Kahnke. Several films about the Louisville native’s life and career will be screened this week, and the Ali Center is hosting a Smithsonian exhibit about people of dual African-American and Native American ancestry.Ali attended a private fundraising dinner at the center Saturday, but Kahnke says he is not confirmed for any of the public birthday events. Ali has battled Parkinson’s disease since the 1980s.