Between the years 2008 and 2013, i worked on an idea for a stationary intelligent robot. It would be able to interact with people around in via simple movements and sounds. This project was too difficult to tackle alone, and as yet, i have not found the right people to collaborate with on the project. Now, one company has taken this idea and made it a reality: www.indiegogo.com/projects/jibo-the-world-s-first-family-robot
Between late 2013 and early 2014, i worked on an engine concept to blow or pump gas (air). The approach was: If my invention generates low air flow, it could be used as a pump. If it generates high air flow, it might be used for lifting objects and people. The concept turned out to be inefficient. Below is a video explaining the concept.
For more about my projects and general interesting tech news, see my Facebook page at www.facebook.com/RENSimpel.