The distance separating the digital world and the real world got a little shorter last week when Hewlett-Packard showed off a tiny wireless chip that can attach data to physical objects...... ..........Memory Spot is similar to a radio frequency identification chip, whose uses include tracking goods in the supply chain. The big difference is that RFID chips store a pointer or reference to a database entry, while Memory Spot stores the data itself. HP's chip has 4 Mbits of memory, despite being about the size of the tip of a pencil. That opens a range of uses, from sticking the...