Today, in the 31st ScienceBeer, Julia was our Science Brewer. Julia is a Professor in Leibniz Institute and works on Institute for Solid State Research. We all heard about hydrogel, but what about nano-sensors or bio-sensors? How about the relation among hydrogels and sensors? This was exactly what we learned today! Julia explained how we can produce these tiny sensors and why they can be of a great help for humans. Thank you Julia.