Snip!t from collection of Alan Dix

<p> No problem: hpDJ can recapture the mood. At this club, the dancers wear biofeedback devices on their wrists or as earrings -- more like fashion accessories than high-tech devices -- designed to monitor the wearer's motion, location, temperature and heart rate.</p> <p> This information is fed to hpDJ over a Bluetooth-style wireless link, allowing it to tell how many people are on the dance floor and, from their temperature and heart rate, how much they are jumping around.</p>