Explore the cutting-edge world of wearable and implantable sensors in this 20-minute talk by Dr. Zhenan Bao, K.K. Lee Professor in the School of Engineering at Stanford University. Delve into the development of non-invasive biosensors and future wearable displays. Learn about the Stanford Catalyst Project's aims and the Mentaid system overview. Discover design considerations for mental health wearables, including variations in heart rate variability and skin conductance across the body. Examine sweat cortisol distribution and the combination of human factors with biosignals. Investigate advancements in bioelectronic interfacial impedance using conducting polymer contacts and skin-inspired electronics. Gain insights into bio-electronics interfaces and the latest innovations in wearable and implantable chemical and biochemical sensors.