Uneasy lies the head that wears a crown, said Shakespeare’s Henry IV, but the king of cycling, Lance Armstrong, wasn’t ...

The protocol is proprietary, however, and we haven’t yet seen anyone reuse these wristbands without tearing them apart or reflashing the microcontroller. [Dani Weidman] tells us, how with [Zach ...

WSJ goes behind the scenes with one LED company, PixMob, to see the tech behind the wristbands. Photo illustration: Madeline Marshall ...