TED-Ed

View full lesson: http://ed.ted.com/lessons/a-digital-reimagining-of-gettysburg-anne-knowles Geographer Anne Knowles uses digital technologies to reimagine the past. In this fascinating talk, Knowles transports us to the Battle of Gettysburg, the turning point of the Civil War. Using Geographic Information Systems (GIS) and historical maps, she traces the footsteps of Robert E. Lee as he orders Pickett's Charge -- and makes an educated guess why he made this crucial mistake. Talk by Anne Knowles.