Is all that metal making you super aggro?  These will tell you when it’s time to take a chill break. Switzerland’s CSEM just finalized the prototype for the Pulsear, headphones that monitor your heartrate via a small infrared sensor. Your iPhone can then take the signals, process them, and plot visually. If you’re the athletic type, this could take separate heartrate monitors completely out of the equation from your run, leaving you with nothing to carry but your iPhone on your arm. That and plenty of Jujubes!