A soft forehead sticker called an e-tattoo tracks brain effort in real time. It replaces bulky EEG gear, detects fatigue early, and adjusts.

Whether it's the Pepsi logo on his left arm, or the burning skull on his right leg, CM Punk has never shied away from ...

While he dons a shooting sleeve on his right arm, Hartenstein's tattoo sleeve is still unmistakable, including elaborate ...