If there's a kryptonite for acne, it's heat. So scientists at Tyrell, Inc., invented the Zeno, a handheld rechargeable device that gives your pimples heat stroke. Hold the tip of the cellphone-size device to your zit for two and a half minutes, and a 16-bit microprocessor emits mea-sured pulses of 119�F heat. (It feels sort of like a hot compress.) Under your skin, bacteria produce stress proteins and self-destruct, halting the inflammation that creates visible blemishes and healing the area faster than other over-the-counter remedies&8212;typically within 24 hours.