Wearable sweat sensor thanks to battery-free ?water pump? inspired by plants

Plants and trees soak up water in the soil by letting it vaporize through pores in the leaves. Scientists have now taken this principle to develop a sweat sensor through which the sweat itself flows at a steady rate and is analysed.
Using laser micro-manufacturing, they made minuscule structures in flexible plastic and integrated a small analytic chip. Their work overcomes an important hurdle towards the development of flexible sweat sensors that can be stuck on the skin.

The substances in our sweat say much about our health, so sportsmen and women stand to gain quite alot as do medical applications. For instance, the saline concentration in sweat can tells us about cystic fibrosis while the acidity level is a decisive factor in certain skin diseases. To be able to monitor the development of this over time,