Now Playing: 10-14-13 Marketplace Tech - Decoding the world's transportation systems

One of the best pieces of toy technology ever imagined is the decoder ring. Well what about having a kind of decoder ring for the world's transportation systems? As part of our recent visit to Boston we caught up with Chris Benson. Benson is working on just that, along with help from student inventors Edward Tiong and Olivia Seow in Singapore. Their product is called the Sesame Ring and its testing ground is Boston's subway system, the T.