Representatives of the Foundation for Cardiovascular Health discuss how blockages are formed in coronary arteries and how coronary artery disease can be prevented and reversed, from 1:30 to 3 p.m., Wednesday, Dec. 21, at Tucson Jewish Community Center, 3800 East River Road; free. The presentation is repeated at 1:30 p.m., Wednesday, Dec. 28, at Northwest YMCA, 7770 N. Shannon Road; free. Call 797-2281 for information.