A new wearable biomarker, 'Entropy,' measuring body energy consumption, has stirred the bio-hacking community. While the name is catchy, the article questions its scientific accuracy and the proven benefits of such tracking, drawing parallels to existing wearables with questionable efficacy. The author highlights human bias towards action and the allure of new tech, suggesting 'Fugacity' as a more fitting, albeit esoteric, name for future biomarkers.