The sense of smell is a tough one to work into media — attempts at getting it into movies date back to the 1930s, and Disneyland and Walt Disney World include scents in some of their attractions. Technology companies have tried adding it to video games and television, so it was only a matter of time before someone tried to add it to a smartphone. In this case, a smartphone add-on about the size of a USB stick that attaches via the 30-pin connector on an iPhone. The add-on is tiny “tank” that contains a given smell. After it’s attached to the phone, a screen comes up with a “puff” button that the user taps to release a scent. The idea is that besides pictures and sound clips, one can send scents. Imagine walking past the microwave popcorn in your local supermarket and your RIFD-enabled smart phone, equipped with scent, blows you a puff of the sweet smell of popcorn.