exergia designs and builds demonstration models, experimental systems, trade fair and museum exhibits in the MINT area and wherever the interplay of technology, IT and design should be made "understandable". A special focus is on the subject of energy conversion and energy storage: How can sunlight be converted into kinetic energy, what concepts are there for generating mechanical energy and electrical power from heat? What can a hydrogen storage system look like? With our kits and models we want to encourage building, experimenting, thinking ...