“Personal computers are available in a wide range of sizes and shapes, and are commonly embedded in clothing and jewelry such as wristwatches, rings, earrings, and other body ornaments. People typically have at least a dozen computers on and around their bodies, which are networked using 'body LANs' (local area networks).”

Ray KurzweilThought Leader

Inventor and futurist, author of The Age of Spiritual Machines

In 2009 the typical person carried one or two computing devices (a phone, perhaps a laptop); computers embedded in clothing and jewelry networked in 'body LANs' did not exist as a mass phenomenon, though several of the functions Kurzweil listed had migrated into smartphones.