Aunt Maude frequently complains of a "draft" while sitting next to a window in her New York apartment in the winter, and she also says her feet get cold. She remarks that the window seems to leak cold air in the winter but not hot air in the summer. (She has air-conditioning, so her windows are closed in the summer.) Using appropriate assumptions, analyze and explain the "draft" problem and make some quantitative estimates of what the draft may be. How does the analysis account for her feet being cold?