Ditch the wristband. Deepinder Goyal’s "Temple" is a revolutionary forehead wearable targeting a 2027 launch.

By monitoring microvascular blood flow near the brain, it tracks "entropy"—a radical new biomarker for physiological stress. While investors value this tech at $500 million, medical experts remain skeptical about its clinical accuracy.

Is this the future of human performance or just expensive, unproven hype?