We are so proud of what Serena Williams is doing on the tennis court. She  has just won her 22nd Grand Slam!!! Go Serena!!! But did you know that presently, Serena is also studying pre-med with the plans on pursuing a medical degree when she retires??!   Imagine being in the hospital emergency room, and you hear across the loud speaker "Paging, Dr. Serena Williams." Then the tennis legend comes to your bedside to ask...