View full lesson: ed.ted.com/lessons/the-history-of-marriage-alex-gendler A white, puffy dress. Eternal love. A joint tax return. Marriage means something different to everyone and has changed over time and across cultures. Alex Gendler traces the history of getting hitched, providing insights on polygamy, same-sex unions and even marriage between the dead and the living. Lesson by Alex Gendler, animation by Augenblick Studios.