Oseh Shalom Synagogue is hosting a refresher course on how to use an automated external defibrillator, or AED, in recognition of American Heart Month, Sun., Feb. 26 from 11:30 a.m. to 1 p.m. and Tue., Feb. 28 from 7 to 8:30 p.m., 7515 Olive Branch Way, in Laurel. Adult and child (age 14 and over) classes also available. Learn how to use this life saving device and update your CPR skills at same time. Classes taught by Dr. Matthias (Eli) Goldstein. Preregister by Feb. 24, 301-498-5151. http://www.Oseh-Shalom.org.