The next stop on the TED Idea Search is Athens, birthplace of democracy and the world's oldest debating tradition. Nine speakers — from a fashion manufacturer taking on modern slavery to a microbiologist tackling the science of bad breath — go head-to-head for a shot to speak on the TED stage in Vancouver. Rehearsals are rocky, nerves are real and the stakes couldn't be higher — and only one speaker gets to move on and represent Athens to the world.