Mega Blog 
Researchers at the University of California have developed a tiny sweat-powered wearable device that can use the sweat of the wearer to produce electricity. Though its capacity is limited for now, researchers believe they can scale the technology to a point where it can power a smartphone.
Sweat-powered Wearable Overview:
This sweat-powered wearable resembles a Band-Aid. It comes in the form of a thin and flexible strip that you can wrap around your fingertip.
Passive energy generation
Unlike other similar power-generating wearables, this doesn’t require active user participation. It can produce electricity when the wearer is passive as well. Even when the wearer is asleep, the device won’t stop generating electricity.
